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Howieite

#BN50940

Howieite

#BN50940
Availability
Sold
Size
5.5 x 3.5 x 1.5 cm - Sm Cabinet 
Formula
Na(Fe2+,Fe3+,Al,Mg)12(Si6O17)2(O,OH)10 (RRUFF)
Locality
Longvale quarry, Mendocino Co., California, United States

Lustrous black, prismatic crystals. Howieite is found in late Mesozoic age metamorphosed shales of the Franciscan Formation.  It was first found at this locality.

Howieite

Formula
Na(Fe2+,Fe3+,Al,Mg)12(Si6O17)2(O,OH)10 
Crystal System
Triclinic 
Crystal Habit
Bladed 
Cleavage
Good, Distinct, Poor 
Luster
Greasy (Oily) 
Color
dark green, black 
Streak
grayish black 
Class
Triclinic 
Hardness

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
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