mineral
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
Turquoise: Hardness 5-6 Mohs, Waxy luster, Triclinic; Coral: Hardness 3.5 Mohs, Vitreous luster, Calcium carbonate structure.
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Physical properties
Turquoise: Hardness 5-6 Mohs, Waxy luster, Triclinic; Coral: Hardness 3.5 Mohs, Vitreous luster, Calcium carbonate structure.
Formation & geological history
Turquoise forms via secondary mineralization in arid regions; Coral is an organic gemstone formed by marine polyps in deep sea environments.
Uses & applications
Used primarily in jewelry making, ornamental carvings, and cultural artifacts.
Geological facts
Turquoise has been mined since at least 6000 BC in Egypt; Red Coral is an organic gem like pearl or amber.
Field identification & locations
Identify Turquoise by its unique blue-green hue and matrix patterns; Identify Coral by its 'wood grain' growth structure under magnification. Common in Southwest US and Mediterranean.
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Metamorphic
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
Granite
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