Minerals
Here are some of the mineral specimens T - Z which can be found in Dave's Down to Earth Rock Shop. This extensive and high quality collection contains many unusual points, minerals, and clusters. 
We also have Exquisite Crystal Carvings available.
Check out our Glossary!

Click here for Minerals A - B!
Click here for Minerals C!
Click here for Minerals D - E!
Click here for Minerals F - H!
Click here for Minerals I - M!
Click here for Minerals N - Q!
Click here for Minerals R - S!

Tanzanite  Location: Africa Variety of: Zoisite  Chemical Composition: Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate Hydroxide Hardness: 6.5 - 7

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!

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

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

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

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

Turquoise Location: Arizona Chemical Composition: CuAl6(PO4)4(OH)8*5(H2O), Hydrated Copper Aluminum Phosphate Hardness: 5 - 6

Utah Picture Stone Location: St. George, Utah Period: Triassic, estimated as being 150 million years old.
	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!
Vanadinite Location: Mibladen Mine Morocco Sub-resinous/sub-adamantine orange, red, brown, yellow, etc. Chemical Composition: Pb5(VO4)3Cl , Lead Chlorovanadate Hardness: 3

	Wendwilsonite  Location: Aghbor Mine Bou Azzev, Morocco
Wulfenite  Location: Red Cloud Mine, Arizona Chemical Composition: PbMoO4, Lead Molybdate Hardness: 3
	Zircon crystal  December Birthstone Location: Kunar, Afghanistan Chemical Composition: ZrSiO4, Zirconium Silicate Hardness: 7.5

Click here for Minerals A - B!
Click here for Minerals C!
Click here for Minerals D - E!
Click here for Minerals F - H!
Click here for Minerals I - M!
Click here for Minerals N - Q!
Click here for Minerals R - S!
Click here for Exquisite Crystal Carvings!

Dave's Down to Earth Rock Shop and
The Prehistoric Life Museum
704 Main Street
Evanston, IL 60202
phone: 847  866 - 7374
fax: 847  866 - 6854

Store Hours: 
M, T, Thurs, F: 10:30 - 5:30
Sat: 10:00 - 5:00
Closed Wednesday and Sunday

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