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Goethite

Type Locality
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany
Mineral Data
α-Fe3+O(OH)
Strunz: 
4.00.
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Nadeleisenerz, Goethita, Goethite - and Gothite