nyuuzyou/wikis huggingface dataset:
Rhodonite

== Description ==
A bright pink, opaque gemstone composed of manganese silicate. Rhodonite is obtained from Russia, Germany, Hungary, Italy, Sweden, Canada, and Australia. It has a pearly to vitreous luster and ranges in color from pink to deep red, often with black veins. Rhodonite slowly tarnishes to brown or black with air exposure. It has been used in jewelry, carvings, and inlays. A variety of rhodonite that contains calcium is called bustamite and is mined in Mexico. A fine, transparent pink variety containing zinc is called fowlerite and is mined in New Jersey.
== Synonyms and Related Terms ==
manganese silicate; manganese spar; bustamite; fowlerite; Rhodonit (Deut.); rodonita (Esp.); rhodonite (Fr.) 
[[[SliderGallery rightalign|Rhodonite IR-ATR RRUFF R040041.png~IR-ATR (RRUFF)|Rhodonite Raman RRUFF R040041.png~Raman (RRUFF)||rhodoniteRS.jpg~Raman (RASMIN)]]]
==Physical and Chemical Properties==
* Triclinic system with rounded tabular crystals; may be massive or granular
* Perfect cleavage in two directions
* Fracture = conchoidal to uneven
* Luster = pearly to vitreous
* Streak = white or colorless.
* Fluorescence = inert
Composition 	MnSiO3
Mohs Hardness 	5.5 - 6.5
Density 	3.4-3.7 g/ml
Refractive Index	1.711 - 1.751
Birefringence 	0.010 to 0.014
==Resources and Citations==
* Gem Identification Lab Manual, Gemological Institute of America, 2016.
* Frank A. Lent, Trade names and Descriptions of Marbles, Limestones, Sandstones, Granites and Other Building Stones Quarried in the United States Canada and other Countries., Stone Publishing Co, New York, 1925
* R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
* Encyclopedia Britannica, http://www.britannica.com Comment: "rhodonite" [Accessed 18 Oct. 2005].
* C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
* Wikipedia: Rhodonite (accessed Sept 14, 2005 and Dec 2022)
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Rhoplex 1950

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex® 1950 (formerly LC-76) has a high solids content of 63% and a low pH of 4.5-5.5. It forms a viscous emulsion that is used as a latex caulk.
== Synonyms and Related Terms ==
Rhoplex LC-76 (sp); Rhoplex® LC-76
== Risks ==
Talas: MSDS
==Physical and Chemical Properties==
Solids = 65% with a pH = 4.5-5.5
Minimum film forming temperature = 0 C
==Resources and Citations==
* Website: www.rohmandhaas.com
* Talas online: http://apps.webcreate.com/ecom/catalog/product_specific.cfm?ClientID=15&ProductID=17848 (accessed July 2007) gives name change from Rhoplex LC-76
Category:Materials database
Rhoplex AC-234

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex® AC-234 has 46-47% solids and dries to form a slightly tacky film. It has been used as a weak pressure sensitive adhesive.
==Physical and Chemical Properties==
Emulsion has 46-47% solids with a pH = 9-10
==Resources and Citations==
* J. Down, M.MacDonald, J.Te'treault, S.Williams, Adhesive Testing at the Canadian Conservation Institute-An Evaluation of Selected Poly(Vinyl acetate) and Acrylic Adhesives", Studies in Conservation 41:19-44, 1996.
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* Marie Svoboda, Conservation Survey Index, unpublished, 1997
* Teri Hensick, contributed information, 1998
* Website: www.rohmhaas.com
Category:Materials database
Rhoplex AC-235

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website: www.rohmhaas.com
Category:Materials database
Rhoplex AC-33

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex AC-33 is composed of a mixture of methyl methacrylate, ethylacrylate, and ethyl methacrylate polymers. The emulsion has 46.5 % solids with a pH of 9.4-9.7. Rhoplex AC-33 dries to form a water resistant film that can be heat activated. It has been used as a base material for acrylic gels and polymer paints. Production of AC-33 has been discontinued and Rhoplex B-60-A has been suggested as a replacement.
== Synonyms and Related Terms ==
Rhoplex AC33 (sp); Primal AC-33 (Europe)
== Applications ==
== Risks ==
* Solutions may contain trace amounts of ammonia or formaldehyde
==Physical and Chemical Properties==
* 46.5 % solids: pH = 9.4-9.7
* Film (unaged): extract pH = neutral
* Film (light aged to simulate 3 yrs): extract pH = 3.7 (Down et al. 1996)
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Conservation Resources: Link (Accessed Aug 6, 2007)
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* Marie Svoboda, Conservation Survey Index, unpublished, 1997
* Conservation Support Systems, Catalog, 1997
Category:Materials database
Rhoplex B-60-A

== Description ==
An aqueous acrylic emulsion containing 46-47% solids of a copolymer (ethyl acrylate and methyl methacrylate). Rhoplex B-60-A has been used for consolidation of masonry, sandstone, mortar, concrete, and plaster. Rhoplex B-60-A has been suggested as a replacement for the discontinued Rhoplex AC-33 as it has a similar polymeric composition without the added thickener incorporated in AC-33 (Conservation Resources 2007).
== Synonyms and Related Terms ==
Rhoplex B60A (sp); Primal B60A (Europe)
== Applications ==
== Risks ==
== Physical and Chemical Properties ==
* Solids content= 46-47% pH=9.4-9.9
* Film formation temperature = 9C
==Resources and Citations==
* Rohm and Haas: Products 
* Conservation Resources ; Catalog
* Conservation Resources: Link (Accessed Aug 6, 2007)
* Contributed information: Gregory Smith, October 2007
Category:Materials database
Rhoplex MC-76

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex MC-76 has a solids content of 46-48% and a pH of 9.5-10. It was designed as a coating for cement and masonry and has been used in the conservation of loose lath plaster.
== Risks ==
* Talas: MSDS
==Physical and Chemical Properties==
* Solids content = 46-48% with a pH = 9.5-10
* Minimum film forming temperature = 10 C
==Resources and Citations==
* Rohm and Haas: www.rohmhaas.com
* Talas online: http://apps.webcreate.com/ecom/catalog/product_specific.cfm?ClientID=15&ProductID=17843 (accessed July 07)
Category:Materials database
Rhoplex N-1031

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website address 1 Comment: www.rohmhaas.com
Category:Materials database
Rhoplex N-560

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website address 1 Comment: www.rohmhaas.com
Category:Materials database
Rhoplex N-580

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion. Rhoplex® N-580 is composed of polybutyl acrylate. The emulsion has a solids content of 54-56% with a pH of 7.5-8.5. Rhoplex® N-580 dries to form a slightly tacky film. Rhoplex N-580 was discontinued in 2018.
==Applications==
* Pressure sensitive adhesive
* Securing small objects with drops prepared by curing on silicone release paper (Velagapudi et al. 2023)
== Personal Risks ==
* Talas: MSDS
==Collection Risks==
Links to Oddy Test results posted on AIC Wiki Materials Database Pages for individual materials below
° Rhoplex N-580 tested in 2013
==Resources and Citations==
* Neeha Velagapudi, Emily Fryer, Sarah Murray, Kristen Ramsdale, Sebastian Denize, Sam Adshead, 'Finding a Temporary Adhesive for Securing Objects for Display in Earthquake-prone Regions' Studies in Conservation, 68(1), 36-42, 2023 link
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* Marie Svoboda, Conservation Survey Index, unpublished, 1997
* Teri Hensick, contributed information, 1998
* Conservation Materials Ltd., Catalog
* Conservation Support Systems, Catalog, 1997
Category:Materials database
Rhoplex N-619

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website address 1 Comment: www.rohmhaas.com
Category:Materials database
Rhoplex comparison chart

Page in process - come back -- 
== Description ==
[Dow formerly Rohm & Haas] A registered trademark for a series of aqueous acrylic emulsions. Rhoplex resins dry to form colorless, transparent films with good durability. Various grades differ in hardness, flexibility and adhesion. It is distributed as Primal in Europe.
== Synonyms and Related Terms ==
Primal
==Resources and Citations==
* Dow: Rhoplex
Category:Materials database
Rhoplex®AC-73

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website: www.rohmhaas.com
Category:Materials database
Rhoplex® LC-40

== Description ==
[Rohm & Haas] A registered trademark for an aqueous acrylic emulsion.
==Resources and Citations==
* Jane Down, Maureen MacDonald, Jean Te'treault, Scott Williams, Adhesive testing at the Canadian Conservation Institute-An evaluation of selected poly(vinyl acetate) and acrylic adhesives., Studies in Conservation, 41, 19-44, 1996
* Website address 1 Comment: www.rohmhaas.com
Category:Materials database
Rhubarb

== Description ==
A natural yellow dye obtained from the roots of the rhubarb plant (Rheum rhaponticum) native to North America. Rhubarb extract gets its yellow color primarily from the colorant chrysophanic acid. The major component in the plant is calcium oxalate. other minor components include emodin, mucilage, resins, rheumic acid, and aporhetin.
== Synonyms and Related Terms ==
pieplant; CI 75400; Natural Yellow 23; chrysophanic acid; rabarber(Dan., Ned., Sven.); Gemeine Rhabarber (Deut.); ruibarbo (Esp.); rhubarbe (Fr.); rabarbraplanten (Nor.); CAS 481-74-3
==Resources and Citations==
* Helmut Schweppe, Schweppe color collection index and information book
* Encyclopedia Britannica, http://www.britannica.com Comment: "rhubarb" [Accessed May 6, 2002].
* Colour Index International online at www.colour-index.org
* Wikipedia: http://en.wikipedia.org/wiki/Rhubarb (Accessed Mar. 20, 2006) -for non-English terms
Category:Materials database
Rhyolite

== Description ==
A general term for a group of fine-grain, often glassy, volcanic rocks. Rhyolites contain quartz and feldspar and are compositionally similar to granite. They occur in lava and often exhibit flow lines, spheroids, and nodular structures. Obsidian is a type of rhyolite. Pumice is a very porous, brittle, lightweight variety of rhyolite.
== Synonyms and Related Terms ==
Rhyolith (Deut.); rhyolite (Fr.); ryolit (Pol., Sven.); riolit (Pol.);
== Physical and Chemical Properties ==
Mohs Hardness	6-6.5
==Resources and Citations==
* Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
* C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
* Wikipedia: http://en.wikipedia.org/wiki/Rhyolite (Accessed Nov. 9, 2005)
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Rib Loc

== Description ==
[Glenbrae, Australia] A brand name for a lightweight plastic ribbed pipe. Rib Loc pipes are prepared from an extruded plastic strip through a spiral winding process. They are manufactured from either unplasticised polyvinyl chloride (uPVC) or high density polyethylene (HDPE). Rib Loc pipes are used for storing testiles and unstretched canvases.
== Synonyms and Related Terms ==
Ribloc
==Resources and Citations==
* Glenbrae: Link
Category:Materials database
Rib knit

== Description ==
Rib (or ribbed) knit fabric has a vertical ridged pattern created through alternating rows of knit and purl stitches. Rib knits have ridges and valleys alternating on both sides of the fabric. they have lengthwise ribs that are stretchier in the width than in the length. Ribbed knit are often used in sweaters, hats, socks, waistlines, collars and cuffs because of its elasticity. A converse pattern, called purl knit, produce the ridges in a horizontal direction. Pattern knits, use variable numbers of knit and purl stiches to produce variable ridges and valleys.
== Synonyms and Related Terms ==
rib knit; rib stitch; purl knit; pattern knit
==Resources and Citations==
* Encyclopedia Britannica: https://www.britannica.com/technology/rib-stitch [Accessed June 2020].
* Wikipedia: http://en.wikipedia.org/wiki/Ribbing_(knitting) [Accessed June 2020]
* Simple Knitting.com at https://www.simple-knitting.com/rib-stitch.html [Accessed June 2020]
Category:Materials database
Ribbed glass

== Description ==
A window glass with thin parallel ribs that act as Fresnel lenses. Ribbed, or prismatic, glass produces a diffuse light. It was installed in factory skylights, storefronts, transoms and windows in early 20th century to provide uniform natural lighting.
== Synonyms and Related Terms ==
prismatic glass; vidro estriado (Port.); American 3-Way Prism; Daylight Prism; Luminous Prism; Luxfer Prism; Seachlight Prism; Solar Prism
==Resources and Citations==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Thomas C. Jester (ed.), Twentieth-Century Building Materials, McGraw-Hill Companies, Washington DC, 1995
Category:Materials database
Rice

== Description ==
A thin stalk of the Oryzo sativa grass. Rice straw is used for papermaking. During World War II it was also used for coarse rope because of the shortage of other bast fibers.
See also rice flour, rice husk, rice oil, rice paper, rice starch, and rice wax
== Synonyms and Related Terms ==
rice straw; arroz (Esp.)
== Physical and Chemical Properties ==
* Fiber width = 6-12 microns; straight with tapering ends; 
* Striations are fine and well-spaced; 
* Parenchymal cells have a serrated edge.
For paper fiber characteristics see straw.
== Additional Images ==
File:Rice.harvest_USDA_ARS.jpg|thumb|Rice harvesting
File:ricewp2.jpg|thumb|Mature rice
File:U.S.Long.grain_Rice_USDA_ARS.jpg|U.S. long grain rice
File:Rice.varieties.comp_USDA_ARS.jpg|Rice varieties
File:rice_straw_det.jpg|Rice straw paper
File:Rice 40x.jpg|Rice paper pulp stained with Graff "C" stain
File:Rice 40x smallvessels.jpg|Rice paper pulp stained with Graff "C" stain
== Resources and Citations ==
* T.Collings, D. Miller, 'The Identification of Oriental Paper Fibers' The Paper Conservator, vol 3, 1978.
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 669
* Silvie Turner, Which Paper?, Design Press, New York, 1991
* Fairchild's Dictionary of Textiles, Phyllis G.Tortora, Robert S. Merkel (eds.), Fairchild Publications, New York City, 7th edition, 1996
Category:Materials database
Rice flour

== Description ==
A fine carbohydrate powder made from ground rice grains obtained from Oryzo sativa grass. Rice flour contains both gluten and starch. Rice flour paste has been mentioned in historic reference for paper restoration, however, it is no longer in use because it is susceptible to attack by microorganisms and is difficult to remove.
== Synonyms and Related Terms ==
rice powder; harina de arroz (Esp.); farine de riz (Fr.); farina di riso (It)
== Resources and Citations ==
* Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
Category:Materials database
Rice husk

== Description ==
The outer seed covering from rice grains, a cereal obtained from genus Oryza sativa. Rice husks are separated from the seed during milling. When burnt, the husks can yield an ash which is greater than 95% silica. Rice husk ash has been used as a filler, an abrasive, and as a refractory material.
== Comparisons ==
== Resources and Citations ==
* Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Rice oil

== Description ==
A clear, colorless, nondrying oil extracted from ground rice kernels. Rice oil is extracted with cold hexane, then the process is repeated with hot hexane to obtain rice wax. Rice oil is used for cooling and as a lubricant. It is resistant to oxidation and spoilage.
== Synonyms and Related Terms ==
rice bran oil; huile de riz (Fr.); aceite de arroz (Esp.); olio di riso (It)
== Resources and Citations ==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 670
* Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Rice paper

1) An unstandardized name for soft, tissue-thin paper. 
2) Paper made from thin layers of pith cut from rice paper trees, Tetrapanax papyrifera cultivated in China and Japan or from Aralia papyrifera cultivated in Thailand. The pith is cut in spirals to form long ribbons. The exposed cellular structure of the pith gives the paper a unique spongy structure. Rice paper is stretchy when wet and brittle when dry. It will crack when heated and is easily damaged by abrasion. Rice paper was popular for Chinese watercolor paintings in the 19th century. The delicate, porous textured paper is also used for artificial flowers. 
3) Paper made from rice straw. See straw.
== Synonyms and Related Terms ==
2) rice plant paper; pith paper; China paper; rijstpapier (Ned.); papier de Chine (Fr.); papier di riz (Fr.); Reispapier (Deut.); carta di riso (It.); papel de arroz (Esp.); papel de China (Esp.); rispapper (Sven.); japanpapper (Sven.)
== Resources and Citations ==
* Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
* The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
* E.J.LaBarre, Dictionary and Encyclopedia of Paper and Paper-making, Swets & Zeitlinger, Amsterdam, 1969
* Bernard Toale, The Art of Papermaking, Davis Publications, Portland OR, 1983
* Silvie Turner, Which Paper?, Design Press, New York, 1991
* Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 578
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Multilingual Glossary for Art Librarians at http://www.ifla.org/VII/s30/pub/mgl.htm
* Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Rice starch

== Description ==
Polysaccharide granules that compose about 70% of the rice kernel. Rice starch is separated from the gluten and fibrous particles by sieving then wash flotation. Rice starch is composed of 17% amylose. Rice starch paste forms a weaker, but more stable, film than wheat starch paste.
== Synonyms and Related Terms ==
rice glue; rice gum; rice powder
== Risks ==
Susceptible to biodeterioration. Dried films become brittle with age.
== Physical and Chemical Properties ==
* Fine, angular granules. 
* Granule size = 3 - 8 micrometers. 
* Gelatinization temperature = 68 - 78 C 
* Reacts with a iodine/potassium iodide solution to give a positive purple color
== Resources and Citations ==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 766
* Rosalie Rosso King, Textile Identification, Conservation, and Preservation, Noyes Publications, Park Ridge, NJ, 1985
* Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* Encyclopedia Britannica, http://www.britannica.com Comment: "cereal processing" [Accessed April 8, 2002].
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Rice wax

== Description ==
A hard, brown wax extracted from ground rice kernels. Rice oil is extracted with cold hexane, then the process is repeated with hot hexane to obtain the wax. Rice wax is used in polishes.
== Synonyms and Related Terms ==
rice bran wax; cera de arroz (Esp.)
== Physical and Chemical Properties ==
Solubility 	hexane
Iodine value 	11.1-19.4
Acid value 	15-17
Saponification value	56.9-104.4
Melting Point 	75.3-79.9 C
Refractive Index 	1.469
== Resources and Citations ==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: melting point = 79C
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: melting point = 75.3-79.9, ref. index=1.469, iodine value=11.1-19.4, acid value=15-17; saponification value = 56.9-104.4
Category:Materials database
Richmond granite

== Description ==
A fine-grain, light gray biotite granite quarried near Richmond, Virginia (Lent 1925). Richmond granite was used as a building stone. An example of its use can be seen on the exterior of the old Executive Office Building in Washington, DC.
==Resources and Citations==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Frank A. Lent, Trade names and Descriptions of Marbles, Limestones, Sandstones, Granites and Other Building Stones Quarried in the United States Canada and other Countries., Stone Publishing Co, New York, 1925
Category:Materials database