Trabzonite
Trabzonite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₄[Si₃O₉(OH)](OH).
It crystallizes in the orthorhombic crystal system (space group Ama2).
Key properties: specific gravity 2.9; White streak; Vitreous luster; optically biaxial.
IMA symbol Trb, IMA status: approved, named in 1983.
A product of retrograde alteration, in a skarn produced by intrusion of a granite into sediments.
It is found associated with Spurrite, rustumite, calcite, vesuvianite, hillebrandite, defernite, tobermorite, killalaite, garnet, perovskite, molybdenite.
The name refers to Trabzon Province, Turkey, where it was first found.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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