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Adamite
Location: Mexico
Chemical Composition: Zn2AsO4(OH), Zinc Arsenate Hydroxide
Hardness is 3.5
Agate
Alternate birthstone for May
Location: Mexico, Brazil, USA, & more
Variety of: Chalcedony
Chemical Composition: SiO2 silicon dioxide
Hardness: 6.5 to 7
Ajoite in Quartz
Location: Arizona, South Africa
Quartz with turquoise colored inclusions.
Chemical Composition: (K, Na)Cu7Al(Si3O8) 3(OH)6 - 3H2O, Hydrated Potassium Sodium Copper Aluminum Silicate Hydroxide
Hardness is 3.5
Alexandrite
Location: Russia
Variety of: Chrysoberyl
Chemical Composition: BeAl2O4 + Fe,Ti beryllium aluminum oxide
Hardness: 8.5
Amazonite
Location: Brazil, Peru, USA
Chemical Composition: KAlSi3O8
Hardness: 6 to 6.5
Amber
Location: Mexico, Poland, Dominican Republic & more
Organic Gemstone
Amber comes translucent or opaque, with colors ranging from milky to red, brown, gold or even black, blue, or green
Chemical Composition: Approximately C10H16O; Succinic acid
Hardness: 2 - 4 Very soft, easy to carve or melt
Amethyst
Birthstone for February
Location: Brazil, Uruguay, Mexico, USA & more
Light to medium delicate purple to lavender.
Variety of: Quartz
Chemical Composition: SiO2 silicon dioxide
Hardness: 7
Ametrine
Location: Bolivia
Combination of Amethyst and Citrine
Variety of: Quartz
Chemical Composition: SiO2 silicon dioxide
Hardness: 7
Apache Tears
Location: Arizona, New Mexico, Nevada
Chemical Composition: Volcanic, amorphous, siliceous glassy rock
Hardness: 5 - 5.5
Apatite
Location: Brazil, Myanmar, Mexico, Canada, Czech Republic, Germany, India, Madagascar, Mozambique, Norway, South Africa, Spain, Sri Lanka, and the United States
Chemical Composition: Ca 5 ( PO 4 ) 3 ( F , Cl , OH )
Hardness: 5
Apophyllite
Location: India, Germany, Canada, Norway, Scotland, Ireland, Brazil, Japan, and throughout the United States
Chemical Composition: KCa4Si8O20(F,OH)·8(H2O)
Hardness: 4.5 - 5
Aquamarine
Birthstone for March
Location: Brazil, Nigeria, Madagascar, Zambia, Pakistan, and Mozambique
Variety of: Beryl
Chemical Composition: Be3 Al2 Si6 O18
Hardness: 7.5 - 8
Aragonite
Location: Worldwide, Germany, Austria, Czechoslovakia, Sicily, Greece, Spain, and Japan
Chemical Composition: CaCO3
Hardness: 3.5-4
Atacamite
Location: Chile, China, Russia, Czech Republic, Arizona, and Australia
Chemical Composition: Cu2Cl(OH)3, Copper Chloride Hydroxide
Hardness is 3 - 3.5
Azurite
Location: Russia, Australia, Chile, Africa, and China & more
Chemical Composition: Cu3(CO3)2(OH)2, Copper Carbonate Hydroxide
Hardness is 3.5-4
Barite
Location: USA, Canada, Mexico & more
Vitreous resinous colorless, blue, white, yellow, brown, gray. etc.
Chemical Composition: BaSO4, Barium Sulfate
Hardness is 3 - 3.5
Bismuth
Location: Lab grown in Germany
Chemical Composition: Bi
Hardness: 2-2.5
Bloodstone
Alternate March birthstone
Location: India & more
Variety of: Chalcedony
Chemical Composition: SiO2 with impurities
Hardness: 7