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Jeffersonite

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CR28668

Jeffersonite

With Antique Label

Description Tabs

Description
Locality: 
Franklin Mine, Franklin, Sussex County, New Jersey, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5 × 4 cm
Largest Crystal: 
0.80cm
Description

Jeffersonite is a zincian manganoan variety of augite. Sharp blackgreen crystals up to 8 mm in matrix.

Mineral Data
What's on the rock

Jeffersonite

Variety Of: 

Augite

Formula: 
(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Strunz: 
9.DA.15
Hardness: 
5.5 - 6.0
Formula: 
Ca(Mn,Zn,Fe)Si2O6
Hardness: 
4.5 - 5.0