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Fornacite

#62911
SOLD
Fornacite from Mammoth mine, Tiger, Pinal Co., Arizona, United States - 62911
Fornacite from Mammoth mine, Tiger, Pinal Co., Arizona, United States - 62911

Fornacite

#62911
Availability
Sold
Size
4.5 x 2 x 1.5 cm - Miniature 
Formula
CuPb2(CrO4)(AsO4)(OH) (RRUFF)
Locality
Mammoth mine, Tiger, Pinal Co., Arizona, United States

This is an interesting way to micromount, but does make some sense since you can view three specimens under the microscope without pulling three individual specimens to study. Usually these contain three minerals of a kind but with different localities. In this case there are three Fornacite specimens, but two localites. The Mammoth Fornacites are the two on the left and have some pretty good (and large) crystals of Fornacite with Wulfenite. The far right specimen is from the Old Yuma mine, Arizona with very tiny crystals.

Fornacite

Formula
CuPb2(CrO4)(AsO4)(OH) 
Crystal System
Monoclinic 
Crystal Habit
Aggregates 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
green, yellow, olive green, greenish yellow 
Streak
greenish yellow 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2-3 

Data courtesy of Webmineral.

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