nyuuzyou/wikis huggingface dataset:
Eosin

== Description ==
A red crystalline dye composed of the potassium, sodium, or lead salt of tetrabromofluorescein. First discovered by Caro in 1871, eosin is primarily used as an acid dye for producing a blood red color in silk, wool, paper, leather, and cotton. It is also used as a histological stain, a cosmetic colorant, and a colorant in red inks. In the late 19th and early 20th century, eosin was also used as a red paint pigment. Alcoholic solutions have a strong green autofluorescence. Eosin is not permanent and fades rapidly in sunlight.
== Synonyms and Related Terms ==
tetrabromofluorescein; Pigment Red 90; CI 45380; D&C Red No. 22; D&C Red No. 21; Acid Red 87; Solvent Red 43; éosine (Fr.); eosina (Esp., Port.); eosin Y; eosine A; eosine G; bromeosin; bromofluoresceic acid; geranium lake; eosine yellowish
== Risks ==
* Causes skin irritation. 
* Fades rapidly in sunlight. 
* Delasco: SDS
== Physical and Chemical Properties ==
* Soluble in ethanol. Insoluble in water (potassium and sodium salts of eosin are water soluble). 
* Maximum absorption wavelength = 520 nm. 
* Maximum emission wavelength = 540 nm.
Composition 	C20H8O5Br4
CAS 	548-26-5
Melting Point 	300 C
Molecular Weight	Mol. wt. = 647.9
== Resources and Citations ==
* M.Ballard (ed.), Important Early Synthetic Dyes. Chemistry, Constitution, Date, Properties. Conservation Analytical Laboratory, Smithsonian Institution, 1991.
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* Monona Rossol, The Artist's Complete Health and Safety Guide, Allworth Press, New York, 1994
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 3639
* Encyclopedia Britannica, http://www.britannica.com Comment: "Chemical Compound."(Accessed 12 May 2004).
* Website: www.probes.com/handbook/sections - gives absorption max=524 and emission max=544
* Website: member.pgonline.com/~bryand/dyes/45380.htm - absorption max = 516
* Colour Index International online at www.colour-index.org Comment: discoverer and date
* Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C20H8O5Br4, CAS= 548-26-5
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Epichlorohydrin

== Description ==
A clear, colorless liquid with a chloroform-like odor. Epichlorohydrin is an epoxide compound that is volatile, highly reactive and unstable. Most commonly, epichlorohydrin is combined with Bisphenol A to form epoxy resins. It is also used as a solvent for natural and synthetic resins, gums, cellulose esters and ethers in paint, varnish, and nail enamel formulations. Epichlorohydrin is used by the paper industry as an additive to paper pulp because it crosslinks on drying to form a high wet-strength paper. In textile applications, epichlorohydrin is used to modify wool by making it more durable and insect resistant. Epichlorohydrin has also been used as an insecticide.
[[[SliderGallery rightalign|epichlorohydrin.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
chloropropylene oxide; chloromethyloxirane; chlorohydrin; 1-chloro-2,3-epoxypropane
== Risks ==
* Toxic by inhalation, ingestion and skin absorption. 
* Overexposure may cause nausea, severe pain, respiratory distress and membrane irritation. 
* Human carcinogen. 
* Sigma Aldrich: SDS
==Physical and Chemical Properties==
Miscible with ethanol, ether, chloroform, trichloroethylene, carbon tetrachloride. Immiscible with water, petroleum hydrocarbons.
Composition 	C3H5OCl
CAS 	106-89-8
Melting Point 	-25.6 C
Density 	1.18 g/ml
Molecular Weight	mol. wt. = 92.5
Refractive Index	1.436
Boiling Point 	117.9 C
==Resources and Citations==
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* 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 Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 3648
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.436
* Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Epidermis

== Description ==
The outermost, nonsensitive layer of skin in an animal or a plant. Epidermis, or cuticle, covers the middle dermis (cutis, corium) layer while the innermost layer is known as the hypodermis (subcutis). In humans, the epidermis is composed of four layers, which are (from the outside): 
1) a layer of dead, horny, flattened cells that form a continuous membrane, 
2) a layer of oily transparent cells, 
3) one or more layers of granular cells and 
4) a layer of rounded pigmented cells. 
The epidermis provides protection from water, sunlight, dirt, bacteria, and other potentially dangerous materials. In dehairing processes, the epidermis is attacked by enzymes or alkalis.
== Synonyms and Related Terms ==
epithelial cells;
==Resources and Citations==
* Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
* Mary-Lou Florian, Dale Paul Kronkright, Ruth E. Norton, The Conservation of Artifacts Made from Plant Materials, The Getty Conservation Institute, Los Angeles, 1990
* Olympus Microscopy Resource Center at http://www.olympusmicro.com/galleries/abramowitz/index.html
* Wikipedia: http://en.wikipedia.org/wiki/Epidermis (Accessed Nov. 2, 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
Epidote

== Description ==
A hydrated calcium aluminum iron silicate used occasionally as a gemstone. Epidote has prismatic shaped crystals that are usually a transparent to translucent pistachio green, although its color may vary from a light yellow green to a darker brownish green. Epidote occurs in metamorphic rocks such as gneisses and schists. Notable occurrences have been found in the Urals, Austria, Switzerland, Italy, France, Norway, Mexico, and the United States (Alaska, Idaho, New Hampshire, Massachusetts, Connecticut, Colorado, California).
== Synonyms and Related Terms ==
pistacite; piedmontite (manganese rich); Epidot (Deut.); epidota (Esp.); epidoto (Port.); epidoot (Ned.);
[[[SliderGallery rightalign|Epidote, Prince of Wales Island.PNG~FTIR (MFA)|Epidoteitaly1.jpg~Raman (U of Parma)|Epidote IR-ATR 40089 RRUFF.png~IR-ATR (RRUFF)|Epidote Raman 40089 RRUFF.png~Raman (RRUFF)]]]
== Physical and Chemical Properties ==
* Monoclinic system with slender, prismatic or fibrous crystals
* Perfect cleavage on one plane 
* Fracture = uneven to flat 
* Luster = vitreous to greasy 
* Streak = colorless to gray
* Fluorescence = generally inert
* Pleochroism = trichroism showing strong green, brown and yellow
Composition 	Ca2(Al, Fe)3(SiO4)3OH
Mohs Hardness 	6 - 7
Density 	3.3-3.6 g/ml
Refractive Index	1.71 - 1.83
Birefringence 	0.019 - 0.045
==Resources and Citations==
* Gem Identification Lab Manual, Gemological Institute of America, 2016.
* Mineralogy Database: Epidote
* C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
* Wikipedia: Epidote (Accessed Sept. 7, 2005 and Dec 2022)
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=3.25-3.50
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* 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
* Encyclopedia Britannica, http://www.britannica.com Comment: "epidote" [Accessed December 11, 2001]. (color photo)(tech info)
Category:Materials database
Epo-Tek 301

== Description ==
[Epoxy Technology, Inc., Billerica MA] A registered trademark for an optically transparent epoxy adhesive. 
* Epo-Tek® 301 has a low viscosity and bonds well to most glass, metals and plastics. It has a RI of 1.538-1.540. It sets in 4-8 hours and is cured in 12-18 hours. 
* Epo-Tek® 301-2 has a refractive index similar to glass (RI = 1.564). It sets in 18-24 hours and can be sanded in 36-48 hours.
== Synonyms and Related Terms ==
Epotek (sp)
== Risks ==
* Moderately toxic by ingestion. 
* Skin contact may cause irritation.
* Epoxy Technologies: SDS
==Resources and Citations==
* Epoxy Technology: Website
* Paisley Products: Epo-Tek
* MSDS Sheet Comment: at MFA
* CoOL DistList Stephen Koob 6 Mar 2002.-PI values
Category:Materials database
Epon resins

== Description ==
[Shell Chemical] A registered trademark for a series of epoxy resins made from epichlorohydrin and bisphenol A derivatives. 
[[[SliderGallery rightalign|aaiEPON_epoxy.jpg~FTIR]]]
* Epon® 825 - pure diglycidyl ether of bisphenol A. 
* Epon® 826 - diglycidyl ether of bisphenol A. 
* Epon® 828 - 
* Epon® 813 - bisphenol resin diluted with cresyl glycidyl ether. 
* Epon® 815 - bisphenol resin diluted with butyl glycidyl ether.
== Synonyms and Related Terms ==
Epon resin
==Resources and Citations==
* Resolution Performance Products: Website
Category:Materials database
Epoxy paint

== Description ==
Enamel-like paint composed of epoxy resins. Epoxy paints provide a strong, dimensionally stable and wear resistant surface. Most epoxy paints are two-component systems that are mixed immediately prior to use. Some one-component epoxies are formulated with ketamine's which react with moisture to release amine curing agents.
== Synonyms and Related Terms ==
peinture époxy (Fr.); tinta epoxídica (Port.); tinta epóxida (Port.)
==Resources and Citations==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977
* Thomas J.S. Learner, Analysis of Modern Paints, Getty Conservation Institute, Los Angeles, 2004
Category:Materials database
Epoxy putty

== Description ==
Epoxy putty/filler refers bulked-epoxy adhesives that, when the components are mixed, will harden at room temperature. Prior to hardening, they typically have a clay-like consistency that can be kneaded, shaped and smoothed. After the epoxy is mixed with a hardener, an exothermic reaction occurs resulting in polymerization into a 'rock hard' compounds that can be sanded, cut, and files. Formulations vary by manufacturers, but common fillers include: chalk, kaolin, fuller's earth or microballoons.
* Please see Phillyseal R for links to several product websites.
== Synonyms and Related Terms ==
masilla epoxi (Esp.);
Example: Pliacre; Phillyseal R; PC Plumbing; PC Marine; Akabond 621; Aves Fixit; Aves Apoxie Scuplt; EV Roberts RF4010 Resin and RF-Hardener
==Resources and Citations==
* Tom Rowland, Noel Riley, A-Z Guide to Cleaning, Conserving and Repairing Antiques, Constable and Co., Ltd., London, 1981
Category:Materials database
Epsom salts

== Description ==
Common name used for magnesium sulfate whose curative powers were first noticed by a farmer at Epsom England. Epsom salts have also been used for dyeing fabrics and tanning leather.
==Resources and Citations==
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* Web elements entry for magnesium at http://www.webelements.com/webelements/elements/text/Mg/hist.html
Category:Materials database
Epsomite

== Description ==
A magnesium sulfate mineral commonly found as an efflorescence on mine and cave walls. Epsomite was discovered at Epsom (Surrey England) in 1695 where it formed from the evaporation of mineral waters. The colorless or white salt often contains trace minerals, such as iron or calcium. Epsomite is purified and sold as Epsom salts for mineral baths.
== Synonyms and Related Terms ==
Epsom salts; bitter salts;
[[[SliderGallery rightalign|epsomiteRS.jpg~Raman (RASMIN)|Epsomite Raman RRUFF X050074.png~Raman (Caltech)]]]
== Physical and Chemical Properties ==
* Soluble in water. 
* Orthorhombic crystals. 
* Bitter to salty taste. 
* Fracture = conchoidal. 
* Luster = vitreous to earthy. 
* Streak = white
Composition 	MgSO4 - 7H2O
Mohs Hardness	2.0 - 2.5
Density 	1.68 g/ml
== Resources and Citations ==
* Mineralogy Database: Epsomite
* Encyclopedia Britannica, http://www.britannica.com Comment: "epsomite" [Accessed December 4, 2001](B/W photo)
* Wikipedia: http://en.wikipedia.org/wiki/Epsomite (Accessed Sept. 7, 2005)
* 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
Erasability

== Description ==
The ability of a paper or a digital storage device to have written or stored information erased without disruption of surface integrity. For a paper, erasure is done by abrading marks or dirt on the surface, thus a hard surface generally has good erasability. For a digital storage device, erasure involves the disordering of magnetic particles. Magnetic devices made out of high quality materials that are not susceptible to degradation should have excellent erasability.
Category:Materials database
Eraser

== Description ==
A piece of rubber, cloth, or felt, used for removing dirt and marks made with a pen, pencil, or chalk. Early erasers were abrasive type materials such as pumice or cuttlefish bone that removed a thin layer of the paper or parchment. Moistened leather pads and breadcrumbs were also used to remove water soluble inks. In the latter part of the 18th century, natural rubber erasers were introduced in France. Rubber, fastice, and the more recent vinyl erasers, often contain fillers and soft abrasives to assist in removing inks and pigments. These types of erasers may leave trace amounts of residue (eraser crumbs) that may later stain paper. 
See also: Design Artgum eraser; Absorene; Draft Clean; India rubber; Fybrglass eraser; Design Kneaded Rubber; Magic Rub eraser; Pink Pearl eraser; Tapeten Reiniger eraser; gum eraser;
== Synonyms and Related Terms ==
rubber (Br.); viskelæder (Dan.); Radiergummi (Deut.); goma de borrar (Esp.); radergummi (Sven.); Design® Artgum [Faber-Castell]; Absorene® [Absorene]; Draft Clean [GH Smith]; fastice; India rubber; Design® Kneadable Rubber [Faber-Castell]; Magic Rub® [Faber-Castell]; Pink Pearl® eraser [Faber-Castell]; Mars Plastic eraser [Staedler]
== Additional Images ==
File:FaberCastel knead.jpg|FaberCastell kneadable eraser
File:Pentel clic eraser.jpg|Pentel clic eraser
File:Pentel Hipoly.jpg|Pentel hi-polymer eraser
File:pink pearl.jpg|Pink pearl eraser
File:artgum eraser.jpg|Artgum eraser
File:staedtler mars.jpg|Staedtler Mars plastic eraser
==Resources and Citations==
* E.Estabrook "Considerations of the Effect of Erasers on Cotton Fabric" JAIC 28:79-96, 1989. Link
* E. J. Pearlstein, D. Cabelli, A. King, & N. Indictor, "Effects of Eraser Treatment on Paper" JAIC 22(1):1-12, 1982. Link
* Marjorie Shelley, The Care and Handling of Art Objects, The Metropolitan Museum, New York, 1987
* Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
* Wikipedia: http://en.wikipedia.org/wiki/Eraser (Accessed Nov. 2, 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
Eraser crumbs

== Description ==
Small pieces of an eraser. Eraser crumbs left on a material may later produce stains.
==Resources and Citations==
* E.Estabrook "Considerations of the Effect of Erasers on Cotton Fabric" JAIC 28:79-96, 1989. Link 
* E. J. Pearlstein, D. Cabelli, A. King, & N. Indictor, "Effects of Eraser Treatment on Paper" JAIC 22(1):1-12, 1982. Link
* Garry Harrison, Indiana University Libraries Preservation Department at www.indiana.edu/~libpres/manual/manfront.html
Category:Materials database
Erbium

== Description ==
A rare earth metal of the yttrium group. Erbium is a soft malleable, metallic solid that forms pink salts as a chloride, oxide, oxalate, nitrate and sulfate. Erbium occurs in small amounts in the following minerals: xenotime, fergusonite, gadolinite, euxenite, polycrase, blomstrandine. It is present in the earth's crust at concentrations of 2.8 ppm. Erbium is primarily used as a phosphor to convert infrared radiation to visible light. It is also used in lasers and as a pink colorant for glass and porcelain.
== Synonyms and Related Terms ==
Er
== Risks ==
* Powdered erbium is flammable. 
* Contact may cause irritation. 
* Fisher Scientific: MSDS
==Physical and Chemical Properties==
Composition 	Er (atomic no, 68)
CAS 	7440-52-0
Melting Point 	1529 C
Density 	9.066 g/ml
Molecular Weight	atomic wt 167.26
Boiling Point 	2868 C
==Resources and Citations==
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* 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 Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 3679
Category:Materials database
Eri silk moth

== Description ==
See attached images.
== Synonyms and Related Terms ==
Samia ricini; Red Eri; White Eri
== Images ==
File:Red.Eri_Samia.ricini_Irene.jpg|thumb|Red Eri silk moth, Samia ricini
File:White.Eri_Samia.ricini_Irene3.jpg|White Eri silk moth, Samia ricini
Category:Materials database
Ermine

== Description ==
The fur trade name for the winter white coat of a stoat (Mustela erminea). Weasels have reddish brown fur in the summer and a thick, white coat in winter with the exception of the tip of the tail which remains black. Found primarily in Eurasia and North America, white ermine fur was highly valuable. During the 14th century in England, only nobility were allowed to wear ermine.
== Synonyms and Related Terms ==
stoat (Mustela erminea); short-tailed weasel; lækat (Dan.); Hermelin (Deut., Sven.); armiño (Esp.); hermine (Fr.); hermelijn (Ned.); gronostaj(Pol.); arminho (Port.);
== Physical and Chemical Properties ==
Color = white in winter Guard hairs = silky
== Additional Images ==
File:Hermelinwinterfellf5.jpg|Stoat Mustela erminea
File:Ermine_Mus.Nat.Hist_Smith.jpg|Ermine
File:erminelarge.jpg|Ermine
== Resources and Citations ==
* Encyclopedia Britannica, http://www.britannica.com Comment: "ermine" [Accessed November 15, 2001].
* Edward Reich, Carlton J. Siegler, Consumer Goods: How to Know and Use Them, American Book Company, New York City, 1937
* Wikipedia: http://en.wikipedia.org/wiki/Ermine (Accessed Nov. 2, 2005)
Category:Materials database
Erosion

== Description ==
A natural degradation process. Erosion is a general term that covers the loss or breaking down of a substance due to wind, rain, ice, waves, chemical reactions or human use. Chemical erosion may occur when a material is altered by dissolution, hydration, oxidation (corrosion) or carbonization. Mechanical erosion occurs when portions of a material are physically separated and transported to a new location.
== Synonyms and Related Terms ==
weathering; Erosion (Deut.); érosion (Fr.); erosão (Port.)
== Additional Images ==
File:Differential.erosion-01_ICOMOS.jpg|Erosion on sandstonePhoto: J. Delgado Rodrigues
File:Differential.erosion-02_ICOMOS.jpg|Erosion on marblePhoto: J. Delgado Rodrigues
File:Loss_of_components_ICOMOS.jpg|Loss of componentsPhoto: V. Vergès-Belmin
File:Loss_of_matrix_ICOMOS.jpg|Loss of matrixPhoto: V. Vergès-Belmin
File:Rounding_ICOMOS.jpg|RoundingPhoto: V. Vergès-Belmin
==Resources and Citations==
* ICOMOS-ISCS: Illustrated glossary on stone deterioration patterns
* Encyclopedia Britannica, http://www.britannica.com Comment: "erosion." Accessed 2 June 2005 .
* 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
* ASTM, "Standard Terminology Relating to Paint, Varnish, Lacquer and Related Products", Annual Book of ASTM Standards, Section 6, Paints, Related Coatings and Aromatics, ASTM, D16, 7-Jan, Jul-96
Category:Materials database
Erosion control fabric

== Description ==
A geotextile designed to mitigate the effects of erosion. Erosion control fabrics are alternatives to rip-rap. They may be used to control or alter the effects of water, wind, sand, traffic or other deteriorating sources. For example, an erosion control fabric can be used to stabilize an embankment by holding the soil in place but allowing water to drain freely.
== Synonyms and Related Terms ==
Geotextil (Deut.); geotêxtil para controlo de erosão (Port.)
==Resources and Citations==
* Hoechst Celanese Corporation, Dictionary of Fiber & Textile Technology (older version called Man-made Fiber and Textile Dictionary, 1965), Hoechst Celanese Corporation, Charlotte NC, 1990
Category:Materials database
Erythrite

== Description ==
A natural hydrated cobalt arsenate mineral. Erythrite occurs in deposits in Morocco (Bou Azzer), Germany (Saxony), Canada (Ontario), Mexico (Sonora). and the U.S. (Idaho). The pink to violet mineral was used as a pigment in paints, glass, and ceramics.
== Synonyms and Related Terms ==
eritrite (Port.); cobalt bloom; erythrine; peach blossom ore; cobaltous arsenate; light cobalt violet
== Risks ==
* Highly toxic by ingestion and inhalation.
==Physical and Chemical Properties==
* Soluble in dilute mineral acids and ammonium hydroxide. Insoluble in water. 
* Monoclinic crystals. 
* Perfect cleavage in one direction. 
* Luster = vitreous to pearly. 
* Streak = pale red to pink
* Under crossed polars, crystals are highly birefringent
Composition 	CO3(As4)2.8H2O
Mohs Hardness 	1.5 - 2.0
Density 	2.91-2.95 g/ml
Refractive Index	1.626-1.701
==Resources and Citations==
* Mineralogy Database: Erythrite
* Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 206
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2495
* 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/Erythrite (Accessed Jan. 15, 2006)
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database