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Franklinite

Type Locality
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Zn2+Fe3+2O4
Strunz: 
4.BB.05
Physical Properties
Colour: 
Black
Crystal System: 
Isometric
Hardness: 
5.5 - 6.0
Tenacity: 
very brittle
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