mineral
Erythrite in Cobaltite Ore
Erythrite (Co3(AsO4)2·8H2O) with Cobaltite (CoAsS)
AI-generated identification · may be incorrectHardness: 1.5-2.5 (Erythrite), 5.5 (Cobaltite); Color: Crimson to peach-pink (erythrite) on steel-gray metallic (cobaltite); Luster: Adamantine to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction.
- Hardness
- 1
- Luster
- Adamantine to pearly
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Physical properties
Hardness: 1.5-2.5 (Erythrite), 5.5 (Cobaltite); Color: Crimson to peach-pink (erythrite) on steel-gray metallic (cobaltite); Luster: Adamantine to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction.
Formation & geological history
Formed as a secondary mineral through the oxidation of cobalt-bearing arsenic minerals like cobaltite and skutterudite in hydrothermally altered ore veins.
Uses & applications
Primarily a collector's mineral; historically used as a prospecting indicator for cobalt and silver deposits.
Geological facts
Erythrite is known as 'Cobalt Bloom' because its vibrant pink color 'blooms' on the surface of dark cobalt ores when they are exposed to weathering.
Field identification & locations
Identify by the distinct pinkish-purple color against a gray metallic matrix. Commonly found in Morocco, Canada, and Germany. Handle with care due to arsenic content.
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