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Mineralpedia Details for Franklinite

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Franklinite

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 
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Franklinite from Franklin, Sussex Co., New Jersey, United States

Franklinite
            from Franklin, Sussex Co., New Jersey, United States

Classic sample of Franklinite with Willemite in fluorescent Albite.  Under shortwave UV, the Albite fluoreces a deep red, in stark contrast to the bright green crystalline Willemite.  Under normal light, we have a number of well crystallized slightly modified Franklinite crystals to 1.5cm. A very nice display sample in both UV and normal lighting. 

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