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Ferberite on Quartz

#AH53361
SOLD
Ferberite from Fourth of July mine, Gilpin Co., Colorado, United States - AH53361
Ferberite from Fourth of July mine, Gilpin Co., Colorado, United States - AH53361

Ferberite on Quartz

#AH53361
Availability
Sold
Size
9 x 7 x 3 cm - Sm Cabinet 
Formula
Fe2+WO4 (RRUFF)
Locality
Fourth of July mine, Gilpin Co., Colorado, United States

Doesn't look like much of a specimen. You really have to get this under the scope to appreciate it. The Ferberite form euhedral crystals to about 1mm. They are prismatic with rectangular, flat terminations. Most have paralleled crystals on the sides and some are splayed outward, while others are somewhat curved or bent from the center of the prism. All the white is a cover of tiny Quartz crystals.

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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On Dakota Matrix
Previously Sold Ferberite
On Dakota Matrix
Other Available Ferberite
WebMineral
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Mindat
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