Trabzonite

trabzonite

defernite

rustumite

foshagite

Images

Formula: Ca4[Si3O9(OH)](OH)
Sorosilicate (Si2O7 groups), paramorph of foshagite
Specific gravity: 2.9
Hardness:
Streak: White
Colour: Colourless
Common impurities: Al,Mn,Mg,Na
Environments

Metamorphic environments

Trabzonite is a product of retrograde alteration, in skarn produced by intrusion of granite into sediments (HOM, Dana).

Localities

At the type locality, Güneyce-Ikizdere, Rize Province, Turkey, trabzonite occurs as a retrograde mineral in a skarn containing spurrite, rustumite, calcite, vesuvianite, hillebrandite, defernite, tobermorite, killalaite, garnet, perovskite and molybdenite (AM 73.1497).

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