Warwickite

minerals

sinhalite

szaibelyite

kotoite

Formula: (Mg,Ti,Fe,Cr,Al)2O(BO3)
Anhydrous borate, warwickite group
Specific gravity: 3.34 to 3.36
Hardness: 5½ to 6
Streak: Bluish black
Colour: Dark brown, grey to black, coppery tinge on cleavage at times, reddish brown in transmitted light
Solubility: Decomposed in sulphuric acid
Environments

Metamorphic environments

Warwickite is a rare accessory mineral in boron-metasomatised limestone and associated skarn. Associated minerals include chondrodite, szaibélyite, sinhalite, spinel, diopside, titanite, dravite, apatite, fluorite, scapolite, graphite, magnetite, ilmenite, pyrite and pyrrhotite (HOM).

Localities

At the type locality, Warwick, Orange county, New York, USA, warwickite was initially found as small, rough crystals in the metamorphosed, crystalline marble known as Franklin marble, associated with spinel, magnetite, ilmenite, graphite, diopside and chondrodite (Mindat).

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