Chrysocolla
Chrysocolla 
Chrysocolla from Nevada, USAGeneral 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 Scalehardness 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 ahardness of 2.5 to 3.5. It is also used as an ornamental stone. It is typically found as glassybotryoidal 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.
Chrysocolla
ChrysocollaThe 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 inEngland, and Arizona, Utah, New Mexico and Pennsylvania in the United States.
Chrysocolla
| Chrysocolla | |
 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 Scalehardness | 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 ahardness of 2.5 to 3.5. It is also used as an ornamental stone. It is typically found as glassybotryoidal 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.
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 inEngland, and Arizona, Utah, New Mexico and Pennsylvania in the United States.
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