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Wolframite

#AH65768
SOLD
Wolframite from Silver Bell mine, Ophir dist., San Miguel Co., Colorado - AH65768
Wolframite from Silver Bell mine, Ophir dist., San Miguel Co., Colorado - AH65768

Wolframite

#AH65768
Availability
Sold
Size
8 x 3.5 x 4 cm - Sm Cabinet 
Formula
(Fe2+, Mn2+)WO4 (RRUFF)
Locality
Silver Bell mine, Ophir dist., San Miguel Co., Colorado
Tagged
ore mineral , tungsten

This specimen was collected personally by Arnold Hampson in 1962. Manganiferous Wolframite has been known to occur in the Ophir district since the 1940's. Eckel (1961) states that the San Juan Mountains contain the most significant and richest occurence in the State. The Wolframite is at or near the Mn end of the Hubnerite-Ferberite series and thus is probably Hubnerite. It is widely distributed in Quartz veins in the Silverton district and elsewhere in the San Juans. 

The specimen contains an abundance of tiny 1-2mm sharp, lustrous, black blades. Excellent specimen from this locality.

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.

Collection
Arnold G Hampson Collection
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