Franklinite
Image: <a href="//commons.wikimedia.org/wiki/User:Islam90" title="User:Islam90">Islam90</a> (CC BY-SA 4.0)
Mineral NameFranklinite
Chemical Formula(Zn,Mn,Fe)Fe₂O₄
Mohs Hardness5.5
Crystal Systemcubic
Lustermetallic
Streak Colorreddish brown
Cleavagenone
Fractureconchoidal
Specific Gravity5.1
Colorsblack, brownish black, dark reddish brown
Transparencyopaque
Type LocalityFranklin, Sussex County, New Jersey, USA
Mineral GroupOxides
Usesminor ore of zinc, minor ore of manganese, collector's specimens
Associated Mineralszincite, willemite, calcite, rhodonite, garnet
Rarityuncommon
Description
This image displays a microscopic view of a Franklinite grain under polarized light, revealing its internal structure, fractures, and a dark, somewhat reddish-brown appearance.
Geological Context
Franklinite is typically found in highly metamorphosed zinc-manganese ore deposits, famously occurring in the unique ore bodies of Franklin and Sterling Hill, New Jersey.
