Hardystonite

hardystonite

vesuvianite

willemite

franklinite

Images

Formula: Ca2ZnSi2O7
Sorosilicate (Si2O7 groups), melilite group
Specific gravity:
Hardness: 3 to 4
Streak: White
Colour: Light brownish white, pale greyish-white, whitish, very pale pinkish
Solubility:
Common impurities: Al,Fe,Mn,Pb,Mg,Na
Luminescence: Fluorescent dull purple to blue under short wave UV, and blue under long wave (Mindat)
Environments

Metamorphic environments

Localities

At the type locality, the Franklin Mine, Franklin Mining District, Sussex county, New Jersey, USA, hardystonite occurs in a metamorphosed zinc-manganese-iron silicate-oxide orebody (Mindat). Associated minerals include vesuvianite, apatite, franklinite, willemite, rhodonite, calcite and dolomite (HOM).

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