Minerals
Here are some of the mineral specimens N - Q 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 R - S!
Click here for Minerals T - Z!

Ocean Jasper
Also known as "Orbicular Jasper"
Variety of: Chalcedony
Chemical Composition: SiO2
Hardness: 6.5 - 7

Opals (tumbled)
October Birthstone
Location: Peru
Chemical Composition: SiO2-nH2O; Hydrated Silicon Dioxide
Hardness: 5 - 6

Papagoite 
Location: S. Africa
Chemical Composition: CaCuAlSi2O6(OH)3; Calcium Copper Aluminum Silicate Hydroxide
Hardness: 5 - 5.5

Peridot
August Birthstone
Location: Suput Pakistan
Variety of: Olivine
Chemical Composition: (Mg, Fe)2SiO4
Hardness: 6.5 - 7

Pearls
Organic Gemstone
Chemical Composition: Calcium Carbonate + organic substances and water
Hardness: 2.5 - 4.5
Colors: white, pink, silver, cream, golden, green, blue, and black
Learn more about pearls!

Petrified Wood
"Bookends"
Location: Oregon
Variety of: Chalcedony
Chemical composition: SiO2, silicon dioxide
Hardness: 6.5 - 7

Petrified wood is fossilized wood with the mineral composition of jasper, chalcedony, and, less frequently, opal; it consists of silicon dioxide only. The wood has not actually become stone as is usually understood by the layman. The organic wood is not changed into stone, but only the shape and structural elements of the wood are preserved. The expert speaks of a pseudomorphosis of chalcedony (or jasper or opal) after wood. 

Pietersite 
Location: Africa
Hardness: 6.5 - 7

Pyrite
"Fool's Gold"
Location: Colorado
Chemical Composition: FeS2, Iron Sulfide
Hardness: 6 - 6.5
Learn more about pyrite!

Quartz
Variety of: Quartz
Location: China
Chemical Composition: SiO2 silicon dioxide
Hardness: 7
Learn more about quartz!

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 R - S!
Click here for Minerals T - Z!

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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