topaz

Name:

topaz

A photo of the mineral topaz

Class:

Silicates

Chemistry:

Al2(SiO4)(F,OH)2 Aluminum hydroxy fluoro silicate

Color(s):

blue, orange, clear, yellow, red, pink, violet, green Streak: white

Hardness:

8

SpecGrav:

3.5 - 3.6

Fracture:

conchoidal

Cleavage:

perfect basal

Crystal:

orthorhombic (often capped columnar-pyramidal)

Envronment:

high temperature formation in igneous rocks and veins, also hydrothermal replacements

Association:

albite, quartz, beryl, rutile

Locals:

| USSR | Brazil | Colorado, Utah, Maine/USA | Germany | Burma | Sri Lanka | Pakistan |

Misc:

The name Topaz is thought to have come from the island named Topazion (after the Greek "topazos"), which was later changed to Zebergit, and is now called St. John's Island, in the Red Sea. It is not found there, but it is believed that it may have been the name originally given to peridot (mineral olivine) which is abundant there.

Photos
& Locals:

1.) Topaz Mtn., Utah
2.) Topaz Mtn., Utah(closeup)
3.) Thomas Mts., Juab Co., Utah
4.) Thomas Mts., Juab Co., Utah

5.) Thomas Mts., Juab Co., Utah(closeup)
6.) Thomas Mts., Juab Co., Utah
7.) Durango, Mexico
8.) Durango, Mexico (closeup)

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Name:	topaz
Class:	Silicates
Chemistry:	Al2(SiO4)(F,OH)2 Aluminum hydroxy fluoro silicate
Color(s):	blue, orange, clear, yellow, red, pink, violet, green Streak: white
Hardness:	8	SpecGrav:	3.5 - 3.6
Fracture:	conchoidal	Cleavage:	perfect basal
Crystal:	orthorhombic (often capped columnar-pyramidal)
Envronment:	high temperature formation in igneous rocks and veins, also hydrothermal replacements
Association:	albite, quartz, beryl, rutile
Locals:	\| USSR \| Brazil \| Colorado, Utah, Maine/USA \| Germany \| Burma \| Sri Lanka \| Pakistan \|
Misc:	The name Topaz is thought to have come from the island named Topazion (after the Greek "topazos"), which was later changed to Zebergit, and is now called St. John's Island, in the Red Sea. It is not found there, but it is believed that it may have been the name originally given to peridot (mineral olivine) which is abundant there.

	Photos & Locals:
		1.) Topaz Mtn., Utah 2.) Topaz Mtn., Utah(closeup) 3.) Thomas Mts., Juab Co., Utah 4.) Thomas Mts., Juab Co., Utah		5.) Thomas Mts., Juab Co., Utah(closeup) 6.) Thomas Mts., Juab Co., Utah 7.) Durango, Mexico 8.) Durango, Mexico (closeup)

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