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Franklinite with Willemite & Alleghanyite

#PD47409

Franklinite with Willemite & Alleghanyite

#PD47409
Availability
Sold
Size
5 x 5 x 3 cm - Miniature 
Formula
ZnFe3+2O4 (RRUFF)
Locality
Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Brilliant, flashy Franklinite crystals to 1mm showing multiple modified crystal forms with acicular, colorless Willemite, and light yellow Barite crystals. The Barite crystals are not all that spectacular and are sparse. According to the olf Gerstmann tag (se prov tab) wthe specimen should have Alleghanyite crystals. I do not see them, but I do not know Franklin very well. The specimn is very similar to the specimen of Modris Baum's under Alleghanyite on Mindat. On the back side there are white to colorless crystals that look like Calcite with needles of Willemite.

Franklinite

Formula
ZnFe3+2O4 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
reddish brown 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
5.5-6 

Data courtesy of Webmineral.

Collection
Phillips Collection

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