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 crystals,
gems and minerals
gems & minerals T - Z
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Tanzanite
Location: Africa
Variety of: Zoisite
Chemical Composition: Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate
Hydroxide
Hardness: 6.5 - 7 |
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Tigereye
This is a combination of raw and tumbled
tigereye. In the tumbled stones, there are
yellow, blue, and red tigereye.
Variety of: Quartz
Chemical Composition: NaFe(SiO3)2 Sodium and
iron with silicon dioxide (quartz)
Hardness: 6.5 - 7
Learn more about Tigereye! |
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Black Tourmaline
Alternate October Birthstone
General composition: (Na, Ca)(Li, Mg, Al)(Al,
Fe, Mn)6(BO3)3(Si6O18)(OH)4
Hardness: 7.0 - 7.5 |
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Black
Tourmaline on quartz
Alternate October Birthstone
General composition: (Na, Ca)(Li, Mg, Al)(Al,
Fe, Mn)6(BO3)3(Si6O18)(OH)4
Quartz is: SiO2
Hardness: 7.0 - 7.5 |
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Tourmaline with
quartz
Alternate October Birthstone
Location: Brazil
General composition: (Na, Ca)(Li, Mg, Al)(Al,
Fe, Mn)6(BO3)3(Si6O18)(OH)4
Quartz is: SiO2
Hardness: 7.0 - 7.5 |
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Tourmaline Rubellite
Alternate October Birthstone
Location: Kunar, Afghanistan
General composition: (Na, Ca)(Li, Mg, Al)(Al,
Fe, Mn)6(BO3)3(Si6O18)(OH)4
Hardness: 7.0 - 7.5 |
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Turquoise
Location: Arizona
Chemical Composition:
CuAl6(PO4)4(OH)8*5(H2O), Hydrated Copper
Aluminum Phosphate
Hardness: 5 - 6 |
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Utah
Picture Stone
Location: St. George, Utah
Period: Triassic, estimated as being 150
million years old. |
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Uvarovite
Also known as "Green Garnet"
Location: Utal Mts., Russia
Vitreous, resinous green.
Chemical Composition: Ca3Cr2(SiO4)3,
Calcium Chromium Silicate
Hardness is 6.5 - 7
Learn more about garnets! |
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Vanadinite
Location: Mibladen Mine
Morocco
Sub-resinous/sub-adamantine orange, red,
brown, yellow, etc.
Chemical Composition: Pb5(VO4)3Cl , Lead
Chlorovanadate
Hardness: 3 |
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Vivianite
Location: Ukraine
Chemical Composition: Fe3(PO4)2-(H2O)8,
Hydrated Iron Phosphate
Hardness: 1.5 - 2 |
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Wavellite
Location: Arkansas
Chemical Composition: Al3(PO4)2(OH)3-(H2O)5,
Hydrated Aluminum Phosphate Hydroxide
Hardness: 3.5 - 4 |
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Wendwilsonite
Location: Aghbor Mine Bou Azzev,
Morocco |
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Wulfenite
Location: Red Cloud Mine, Arizona
Chemical Composition: PbMoO4, Lead Molybdate
Hardness: 3 |
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Zircon
crystal
December Birthstone
Location: Kunar, Afghanistan
Chemical Composition: ZrSiO4, Zirconium
Silicate
Hardness: 7.5 |
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