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.

Identified May 9, 2026More mineral →

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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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Banded Gneiss (River Rock/Pebble)

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