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Mineralpedia Details for Molybdofornacite

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Molybdofornacite

Molybdofornacite

Named after the molybednite in the composition and the relationship of the mineral to fornacite. A rare mineral, Molydofornacite occurs in oxidized, dolostone-hosted, polymetallic hydrothermal ore deposits at its type locality at the Tsumeb mine in Tsumeb, Namibia. Other localities for Molybdofornacite include in the United States, and Mexico as well as newer localities in Chile, France, and Germany. 

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/molybdofornacite.pdf

Formula
CuPb2MoO4AsO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Pistolitic, Lath 
Cleavage
None, None, None 
Luster
Adamantine 
Color
light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2-3 
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Molybdofornacite from San Pablo mine, Inca de Oro, Chile

Molybdofornacite
            from San Pablo mine, Inca de Oro, Chile

Bright apple green platy micro crystals in little rosettes to about 0.75mm.

Click thumbnail images for larger view.

Molybdofornacite from Tsumeb mine, Tsumeb, Namibia

Molybdofornacite
            from Tsumeb mine, Tsumeb, Namibia

Bright translucent green prismatic micro crystal to about 0.5mm or more.

Click thumbnail images for larger view.

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