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Wolframite with Molybdenite

#56160

Wolframite with Molybdenite

#56160
Availability
Sold
Size
4 x 2.8 x 2 cm - Miniature 
Formula
(Fe2+, Mn2+)WO4 (RRUFF)
Locality
Black Pearl mine, Loco Gulch, Eureka dist., Yavapai Co., Arizona, United States

This is a great locality specimen of a combination of minerals not generally seen together. The "wolframite" is black of course, and the Molybdenite is on the backside as a thin veneer. The mineral list would suggest a pegmatite, but looks like from Mindat, there are gold-quartz veins in a host rock of hornblende granite.

Wolframite

Formula
(Fe,Mn)WO4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Lamellar, Massive - Granular 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
brownish black, iron black 
Streak
reddish brown 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4.5 

Data courtesy of Webmineral.

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