[DOC] [TLE] On the Origin of Digit Patterns in Gem Opal | Gems & Gemology - GIA [PAR] An examination of the finger-like feature mostly found in Ethiopian opal, and ... 
Opal is a poorly crystallized or amorphous hydrated silica formed through the ... 
Precious opals are mined in many parts of the world, most notably in Australia, 
Brazil, ... In samples that contain less matrix and abundant patches, the digit ends 
are... [DOC] [TLE] Classic Rocks and Gems - Timeline | Facebook [PAR] +49 173 5287561 ... The Ethiopian Welo Opal was only discovered in 2008. ... (3) 
precipitation of a new silica gel in the space between the digits; and (4) the ... 
Opal is a poorly crystallized or amorphous hydrated silica formed through the ... 
This 1.5 cm stone shows rounded patches on one side (left) and columns on the
... [DOC] [TLE] Hydrated Silica Gel Gemstones and Minerals | Gem5.com [PAR] The following is a list of Hydrated Silica Gel gems and minerals listed in our 
database. ... It is usually found as light-blue or green masses, nodules, and veins, 
sometimes .... Varieties include Selenite (or "spectacle stone), which is colorless 
and... [DOC] [TLE] Gemstones by Durango Silver Co - Durango Silver Company [PAR] Other deposits also exist in Australia, China, India, Mexico, Madagascar, ... This 
stone can be found in China, India, Kenya, Madagascar, Namibia, Russia and 
the ..... Large well formed crystals though can be found in certain contact 
metamorphic rocks. ...... Additional layers of the monomeric silicic acid attach to 
this silica gel... [DOC] [TLE] About the Guide - American Chemical Society [PAR] The ChemMatters CD can be purchased by calling 1-800-227-5558. Purchase 
information can be found online at www.acs.org/chemmatters ... How many 
silicon atoms surround each oxygen atom in the silica crystal? How are ... At 
junctures inside the stone where sphere size is changing, reflected colors will 
change also. [DOC] [TLE] Full text of "Gems & Gemology Fall 2013" - Internet Archive [PAR] 148 Agates from Sidi Rahal, in the Atlas Mountains of Morocco: Gemological ... 
To purchase print subscriptions, visit store.gia.edu or contact Customer Service. 
..... Loose gem- stones found in the Cheapside Hoard include banded agate, 
sard, and ..... Through dehydration and cementation, this silica gel forms a solid 
opal. [DOC] [TLE] C:\Documents and Settings\Alan Smithee\My Documents\MOTM ... [PAR] opalescence, its gemological history, and the importance of opal in the culture 
and ... colloidal silica gel consisting of randomly arranged, hydrated silica 
molecules ... large Australian deposits in the 1880s, precious opal was quite rare. 
.... Opal, which is relatively abundant and found worldwide, occurs in both 
volcanic. [DOC] [TLE] Mineral of the MonthJune 2014 - Celestial Earth Minerals [PAR] Opal is an amorphous, layered, solidified, colloidal silica gel consisting of ... 
arranged, hydrated silica molecules interspersed with layers of microscopic ... 
Peruvian pink opal is specifically considered to be a stone of love and .... 
abundant and found worldwide, occurs in volcanic, sedimentary, and ..... The 
direct contact of. [DOC] [TLE] C:\Documents and Settings\Alan Smithee\My Documents\MOTM ... [PAR] with rainbow lightning; the aurora borealis captured in stone. ... opalite, and gel
-quartz. .... hydrated silica tetrahedra, these variably sized spherules create ... 
While the lesser grades of opal are relatively abundant, sources of .... Until the 
late 1800s, when prospectors discovered huge opal deposits in Australia and 
smaller... [DOC] [TLE] Hydrated silica - Wikipedia [PAR] Hydrated silica is a form of silicon dioxide, which has a variable amount of water 
in the formula. It is also known as silicic acid, a term usually used for its form 
dissolved in water. It is found in nature, as opal (which has been mined as a 
gemstone for ... Once dehydrated the gel is used as a desiccant known as silica 
gel. [DOC] [TLE] About opal - NSW Resources and Energy [PAR] Each stone has its own individual pattern and range of colours, and its colours 
and ... Australia produces over 90% of the world's supply of precious

Question: Gemologists call this stone found in abundance in Australia hydrated silica gel
Answer: opal