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Jacobsite



Jacobsite
CategoryMineral
Chemical formulairon(II,III) manganese oxide, MnFe2O4
Identification
ColorBlack
Crystal habitDisseminated to massive
Crystal systemIsometric Hexoctahedral
Cleavagenone
FractureConchoidal
Mohs Scale hardness5.5 - 6.0
LusterMetallic
Refractive indexOpaque
Streakreddish black
Specific gravity4.75

Jacobsite is a manganese iron oxide mineral. It is a magnetite spinel.

Additional recommended knowledge

It was first described in 1869 and named for the location of Jakobsberg, Sweden.

References

  • Mindat with location data
  • National Pollutant Inventory - Manganese and compounds Fact Sheet
  • Webmineral.com article
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Jacobsite". A list of authors is available in Wikipedia.
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