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Goethite (Iridescent Stalactite)

Goethite – FeO(OH)

Elements: Iron, Oxygen, Hydrogen

Class: Oxides

Crystal System: Orthorhombic

Hardness: 5-5.5

Apatite

Talc (1)Diamond (10)

About as hard as a steel knife blade.

Origin: Tharsis, Huelva, Andalusia – Spain