[DOC] [TLE] Opal - Wikipedia [PAR] Opal is a hydrated amorphous form of silica its water content may range from 3 to 
21% by ... Besides the gemstone varieties that show a play of color, the other 
kinds of ... The most famous source of fire opals is the state of Quertaro in 
Mexico; these ... The world's largest and most valuable gem opal "Olympic 
Australis" was... [DOC] [TLE] Mexican Fire Opal - GemSelect [PAR] Mar 4, 2008 ... All of the opals have a variety of gemstone characteristics which are, let us say, 
less than ideal. ... This is an opal known not for its play of color, but for its vivid 
body color, ... People seeing these gems for the first time are often surprised to ... 
Since fire opal has a high water content, it should be protected from... [DOC] [TLE] Fire Opal - International Colored Gemstone [PAR] It was believed that a gem that bubbled over with vivacity to such an extent as the 
fire ... It is in Mexico that the most significant fire opal deposits in the world lie. ... 
Their warm, expressive orange comes in all varieties from yellow to light red, ... 
consists of silicic acid with a relatively high water content, was named for its 
colour. [DOC] [TLE] Mexican Opal Gemstone Information at AJS Gems [PAR] Mexican Opals are known for their vivid yellow, orange or orange-red colors. The 
intense color has earned this gem the nickname fire opal. ... It is the few varieties 
of opal that can successfully be faceted, as some specimens can exhibit 
considerable ... While Opal contains water, the water content does vary by stone. [DOC] [TLE] Pictures of Opal - Black, Fire, Boulder, Rough, Jelly, Crystal [PAR] Photos of opal: Many types of popular and colorful opals from localities ... Other 
countries that produce precious and fancy varieties of common opal include: 
United States, Mexico, ... of spectral color, known as "fire" that are produced by 
gem-quality diamond. ..... Since opal is a hydrated silicate its formation requires 
water. [DOC] [TLE] Opal: The mineral Opal (black, white, fire) information and pictures [PAR] Once a specimen is taken out of the water its susceptibility increases. ... Orange-
red to bright red variety of Mexican Fire Opal. ... Also known as Liver Opal. [DOC] [TLE] Opal Description - GIA [PAR] Opal is known for its unique display of flashing rainbow colors called play-of-
color. ... During dry periods, much of the water evaporated, leaving solid deposits 
of ... Although experts divide gem opals into many different categories, five of the 
main types are: ... often doesn't show play-of-coloris also known as Mexican 
opal. [DOC] [TLE] Gemstones - Opal - U.S. Geological Survey [PAR] Jan 11, 2013 ... Opal has over one hundred variety and trade names, but the list of accepted ... 
Australia is famous for its white and black precious opal. ... Until recently, the best 
fire opal came from Mexico. ... The Spencer opal mine, the largest privately 
owned gem stone producer in the State, is the major producer of opal. [DOC] [TLE] Opal Value, Price, and Jewelry - International Gem Society [PAR] As a gem species, opal is so unique it has its own descriptive vocabulary. .... 
Water opal has a transparent or colorless body that may have fire in it. ... These 
stones are also called Mexican or sun opals. .... Major finds of Australian opal are 
best known from specific localities: Lightning Ridge: black opal in nodules, world'
s... [DOC] [TLE] Gemstones A-Z with detailed gemstone descriptions - Maker Mends [PAR] Origin of name Latin "aqua"meaning water and "mar"sea. Legend has it ... The 
more intense the colour of an Aquamarine, the higher its value.The principle .... It 
is primarily found in Mexico, so is often known as Mexican fire opal. Fire opal .... 
MOONSTONE, Moonstone is the best known gem variety of orthoclase feldspar. [DOC] [TLE] Fire Opal - A Gem to Tame the Fire Within - Access Gems [PAR] The warm

Question: Mexico is known for its water & fire varieties of this gem
Answer: opal