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Wednesday, November 12, 2008

Chrysocolla (CuAI) 2H2Si2O5(OH)4nH2O Silicates/phyllosilicates

Physical Features
1. Color- Blue, blue-green.
2. Streak- Pale blue, tan, gray.
3. Luster- Vitreousto earthy.
4. Cleavage- None.
5. Transparency- Transparent to nearly opaque.
6. Fracture- Uneven to conchoidal.
7. Hardness- 2-4.
8. Forms- Massive.
9. Crystal systems- Orthorombic.
Chrysocolla is a mineral that is made from hydrated copper silicate. It most commonly forms in the oxidation zones of copper ore bodies. Many times chrysocolla is associated with other minerals, such as quartz, limonite, azurite, malachite and cuprite, which are frequently intergrown together. Typically found as glassy botryoidal or rounded masses and crusts, or vein fillings. Chrysocolla is sometimes confused with turquoise because of it's light color. Some say it's used for inspiration or creativity, and may help to promote communication.

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