Freiberg, Germany/freiberg290
Previous | Home | NextThis is an early Bergakademie official collection of minerals for the Moh'sche Härteskala (Moh's hardness scale).
Freiberg, Germany/freiberg290Previous | Home | NextThis is an early Bergakademie official collection of minerals for the Moh'sche Härteskala (Moh's hardness scale). |
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