Goethite

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: Salisbury Mine, Connecticut – Usa History: Ex Paterson Museum Collection

More minerals containing Hydrogen