Azoproite

azoproite

perovskite

baddeleyite

tazheranite

Images

Formula: Mg2[(Ti,Mg),Fe3+]O2(BO3)
Anhydrous monoborate, ludwigite group, titanium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.63 meaasured, 3.63 calculated
Hardness: 5½
Colour: Black
Solubility: Readily dissolved by dilute hydrochloric acid, not dissolved by 1:3 nitric acid
Magnetism: Paramagnetic
Environments

Metamorphic environments

Localities

At the type locality, the Tazheranskii Massif, Lake Baikal area, Russia, azoproite occurs as an uncommon late-stage mineral in the border zone in magnesian contact metamorphic rocks associated with syenites. The azoproite forms prismatic crystals 1 to 20 mm long and 0.1 to 5 mm wide. Associated minerals include calcite, ludwigite, brucite, clinohumite, baddeleyite, tazheranite, perovskite, geikielite and forsterite (HOM, Mindat).
Azoproite from the Tazheranskii Massif - Image

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