Minerals
Here are some of the mineral specimens R - S 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 T - Z!

Red Quartz 
(see also Harlequin Quartz)
Location: Spain 
This is quartz with hematite.
Variety of Quartz
Chemical Composition: SiO2 and Fe2O3
Hardness: 7

Rhodochrosite
(also called raspberry spar or manganese spar)
Location: Colorado
Chemical Composition: MnCO3, Manganese Carbonate
Hardness: 3.5 - 4
Learn more about rhodochrosite!
Rhodonite
Location: Madagascar
Chemical Composition: (Mn, Fe, Mg, Ca)SiO3 manganese silicate
Hardness: 5.5 - 6.5
Rose Quartz Crystals
Location: Brazil
Light rose to a deep rose color
Variety of: Quartz
Chemical Composition: SiO2 
Hardness: 7 
Learn more about Rose Quartz!
Ruby crystals in matrix
Location: Jagdalak Afghanistan
Variety of: Corundum
Chemical Composition: Al2O3
Hardness: 9
Ruby-in-Zoisite 
Location: Madagascar
Chemical Composition of Zoisite: Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate Hydroxide
Hardness: 6 - 7
Rutilated Quartz
Location: Brazil
Variety of: Quartz
Quartz chemical composition: SiO2 
Rutile chemical composition: TiO2 
Hardness: quartz 7, rutile 6 to 6.5
Selenite 
Location:  Fuentes de Ebro, Zaragoza Spain
"Selenite" is the colorless and transparent variety of gypsum that shows a pearl like luster and has been described as having a moon like glow. The word selenite comes from the Greek word for Moon and means moon rock.
Chemical Composition: CaSO4-2(H2O), Hydrated Calcium Sulfate
Hardness: 2 and can be scratched by a fingernail

Septarian 
Location: Henry Mountains of Utah. 
Chemical Composition: CaCO3
The inside gold colored crystals are calcite and the brown banding is iron calcite. The outer surface was originally mud which, over millions of years, hardened into rock.

Smoky Quartz Elestial
Location: Brazil
Variety of: Quartz 
Chemical Compisition: SiO2
Hardness: 7
Learn more about Smoky Quartz!

Spectrolite
Location: Finland
Trade name for Labradorite from Finland.
Learn more about labradorite and spectrolite!

Stibnite 
Location: Romania
Chemical Composition: Sb2S3, Antimony Sulfide
Hardness: 2

Stibnite in Drusy quartz on chalcedony 
Location: Herja Mine, Basa Mare Romania
Chemical Composition: Sb2S3, Antimony Sulfide
Hardness: 2
Sugilite with bustamite (tumbled)
Location: Africa
Chemical Composition: KNa2Li3(Fe, Mn, Al)2Si12O30, Potassium Sodium Lithium Iron Manganese Aluminum Silicate
Hardness: 6 - 6.5

Sugilite, some with bustamite (tumbled)
Location: SW Africa
Chemical Composition: KNa2Li3(Fe, Mn, Al)2Si12O30, Potassium Sodium Lithium Iron Manganese Aluminum Silicate
Hardness: 6 - 6.5

Sulfur
Location: Baja Mexico
Translucent resinous yellow
Chemical Composition: S , Elemental Sulfur
Hardness: 2

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 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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