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0 item @ $0.00  

Ferberite

#AH51828

Ferberite

#AH51828
Availability
Sold
Size
9 x 5 x 3.5 cm - Sm Cabinet 
Formula
Fe2+WO4 (RRUFF)
Locality
Lower Rambler mine, Beaver Creek dist., Boulder Co., Colorado, United States
Tagged
tungsten

Does not look like much of a specimen, but under the scope there are hundreds of black, lustrous, tabular crystals to around 1mm.

The Lower Rambler was a tungsten mine in the early 1900's and was a substantial producer after the tungsten was discovered in the Nederland area in 1899. The mine sits at an elevation of 8,575ft. It is described in various USGS reports, which describes the Ferberite crystals occuring in "horn" breccia and sheeted granite. The Nederland area during the early 1900's was considered the most important ferberite-producing district in the world. It is centered around Nederland in Boulder county in scattered deposits and is roughly 4 to 5 miles wide and 10-12 in length.  

Hampson self-collected this specimen in 1963. This may be described as a "legacy" specimen.

Read Hampson's bio here.

Ferberite

Formula
Fe2+WO4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Lamellar, Massive - Granular 
Cleavage
Perfect, Parting, Parting 
Luster
Sub Metallic 
Color
black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection
Mineralpedia
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