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 crystals,
gems and minerals
gems & minerals R - S
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Red Quartz
(see also Harlequin Quartz)
Location: Spain
This is quartz with hematite.
Variety of Quartz
Chemical Composition: SiO2 and Fe2O3
Hardness: 7 |
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Rhodochrosite
(also called raspberry spar or manganese
spar)
Location: Colorado
Chemical Composition: MnCO3, Manganese
Carbonate
Hardness: 3.5 - 4
Learn more about rhodochrosite! |
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Rhodonite
Location: Madagascar
Chemical Composition: (Mn, Fe, Mg, Ca)SiO3
manganese silicate
Hardness: 5.5 - 6.5 |
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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!
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Ruby crystals in matrix
Location: Jagdalak Afghanistan
Variety of: Corundum
Chemical Composition: Al2O3
Hardness: 9
Learn more about Ruby! |
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Ruby-in-Zoisite
Location: Madagascar
Chemical Composition of Zoisite:
Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate
Hydroxide
Hardness: 6 - 7 |
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Rutilated Quartz
Location: Brazil
Variety of: Quartz
Quartz chemical composition: SiO2
Rutile chemical composition: TiO2
Hardness: quartz 7, rutile 6 to 6.5 |
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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 |
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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. |
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Stibnite
Location: Romania
Chemical Composition: Sb2S3, Antimony
Sulfide
Hardness: 2 |
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Stibnite in Drusy quartz on
chalcedony
Location: Herja Mine, Basa Mare Romania
Chemical Composition: Sb2S3, Antimony Sulfide
Hardness: 2 |
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Sugilite
with bustamite (tumbled)
Location: Africa
Chemical Composition: KNa2Li3(Fe, Mn,
Al)2Si12O30, Potassium Sodium Lithium Iron
Manganese Aluminum Silicate
Hardness: 6 - 6.5 |
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Sulfur
Location: Baja Mexico
Translucent resinous yellow
Chemical Composition: S , Elemental Sulfur
Hardness: 2 |
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