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 crystals,
gems and minerals
gems & minerals C
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Calcite
Chemical Composition: CaCO3, Calcium Carbonate
Hardness is 3 (only on the basal pinacoidal faces, calcite has a
hardness of less than 2.5 and can be scratched by a fingernail).
Learn more about calcite! |
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Carnelian
Alternate August Birthstone
Variety of: Chalcedony
Chemical Composition: SiO2
Hardness: 6.5 to 7
Location: Madagascar
Learn more about
Carnelian! |
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Cavansite
Location: India
Chemical Composition: Ca(VO)Si4O10(H2O)4,
Hydrated Calcium Vanadium Silicate
Hardness: 3 - 4 |
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Celestite
Location: Madagascar
Chemical Composition: SrSO4, Strontium
Sulfate
Hardness: 3 - 3.5 |
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Charoite
Location: Russia
Chemical Composition: K(Na, Ca)11(Ba,
Sr)Si18O46(OH, F)-nH2O, Hydrated Potassium
Sodium Calcium Barium Strontium Silicate
Hydroxide Fluoride
Hardness: 5 |
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Chrysanthemum Rock
Location: China
Aragonite crystals in basalt |
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Chrysoprase
Location: Yerilla Australia
Variety of: Chalcedony
Chemical Composition: SiO2 silicon dioxide
Hardness: 6-7
Learn more about
chrysoprase! |
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Cinnabar
on calcite
Location: China
Chemical Composition: HgS, Mercury Sulfide
Hardness: 2 - 2.5 |
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Citrine
November Birthstone
Location: Brazil
Variety of: Quartz
Chemical Composition: SiO2
Hardness: 7 |
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Citrine
November Birthstone
Location: Minas Gerais, Brazil
Variety of: Quartz
Chemical Composition: SiO 2
Hardness: 7 |
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Judy's
Citrine
November Birthstone
Location: Brazil
Approx. 12" long and 5" at it's widest
Yellow to gold to brownish gold quartz.
Variety of: Quartz
Chemical Composition: SiO 2
Hardness: 7 |
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Crystallized Native Copper
Location: Michigan
Metallic light rose, light orange to red.
Chemical Composition: Cu, Elemental Copper
Hardness: 2.5-3 |
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Coral
Organic Gemstone
Colors: red, pink, white, black, or blue
Chemical composition: CaCO or organic
substance
Hardness: 3 - 4
Usually controlled
by environmental laws |
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Crocoite
Location: Adelaide Mine, Dundas Tesinania
Australia
Chemical Composition: PbCrO4 , Lead Chromate
Hardness: 2.5 - 3 |
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Cuprite with malachite
Location: Mashamba West, Shaba Zaire
Chemical Composition: Cu2O, Copper Oxide
Hardness: 3.5 - 4 |
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