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Chrysocolla

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Chrysocolla
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Chrysocolla from Nevada, USA
General
Category Silicate mineral
Chemical formula (Cu,Al)2H2Si2O5(OH)4·nH2O
Identification
Color Blue, blue-green, green
Crystal habit Massive, nodular, botryoidal
Crystal system Orthorhombic
Cleavage none
Fracture Brittle to sectile
Mohs scale hardness 2.5 - 3.5
Luster Vitreous to dull
Streak white to a blue-green color
Diaphaneity Translucent to opaque
Specific gravity 1.9 - 2.4
Optical properties Uniaxial (+)
Refractive index nω = 1.460 nε = 1.570
Birefringence +0.110

Chrysocolla (hydrated copper silicate) is a mineral, (Cu,Al)2H2Si2O5(OH)4·nH2O. It is of secondary origin and forms in the oxidation zones of copper ore bodies. Associated minerals are quartz, limonite, azurite, malachite, cuprite, and other secondary copper minerals.

Chrysocolla has an attractive blue-green colour and is a minor ore of copper, having a hardness of 2.5 to 3.5. It is also used as an ornamental stone. It is typically found as glassy botryoidal or rounded masses and crusts, or vein fillings. Because of its light color, it is sometimes confused with turquoise. Commonly it occurs only as pourous crusts unsuitable for gem use, but high quality, gem grade chrysocolla can be translucent and is highly prized.

Archivo:Chryzokola, gryf 26.jpg
Archivo:Chrysokoll Chrysocolla.jpg

The name comes from the Greek chrysos, "gold", and kolla, "glue", in allusion to the name of the material used to solder gold, and was first used by Theophrastus in 315 BCE.

Notable occurrences include Israel, Democratic Republic of Congo, Chile, Cornwall in England, and Arizona, Utah, New Mexico and Pennsylvania in the United States.

ReferencesEditar

ca:Crisocol·la

de:Chrysokoll es:Crisocola eu:Krisokola gl:Crisocola he:כריזוקולה nl:Chrysocolla ja:珪孔雀石 pl:Chryzokola pt:Crisocola sk:Chryzokol

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