limonite iron crusher feldspar


     · In the oxidised portions of lodes limonite cuprite malachite and azurite (copper carbonates) are found in many places. In the sulphide zone below water level gold is associated commonly with either iron pyrites or mispickel (arsenopyrite) and to a less extent with galena copper pyrites (chalcopyrite) zinc blende (sphalerite

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  • TurquoiseWikipedia

     · Turquoise is an opaque blue-to-green mineral that is a hydrated phosphate of copper and aluminium with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years owing to its unique hue. Like most other opaque gems turquoise has been devalued by the introduction onto the market

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