Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
cubicuncommonOxides (Spinel Group)
Franklinite
(Zn,Mn,Fe)Fe₂O₄
This image displays black, submetallic to metallic Franklinite crystals, appearing somewhat blocky and granular, likely embedded within a lighter matrix.
Franklinite Physical Properties
Mohs Hardness
5.5Crystal System
cubicLuster
metallicStreak Color
reddish brownCleavage
noneFracture
conchoidalSpecific Gravity
5.1Colors
black, dark brownTransparency
opaqueType Locality
Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USAMineral Group
Oxides (Spinel Group)Uses
collector, minor ore of zinc and manganeseAssociated Minerals
zincite, willemite, calcite, rhodoniteRarity
uncommonGeological Context
Franklinite is a characteristic mineral of highly metamorphosed zinc-manganese ore deposits, famously found in the unique ore bodies of Franklin and Sterling Hill, New Jersey, where it forms under specific high-temperature, low-pressure conditions.
