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Limonite

Limonite – FeO(OH)·nH₂O

Elements: Iron, Oxygen, Hydrogen

Class: Oxides – Hydroxide

Crystal System: Amorphous

Hardness: 4-5.5

Apatite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Origin: Qinglong Mine, Qianxinan, Guizhou – China