Oxide, microlite group, tantalum-bearing mineral
Specific gravity: 6.333 calculated
Hardness: 5 to 5½
Colour: Brownish yellow to brownish red
Oxycalciomicrolite is a relatively new mineral, approved in 2019.
At the type locality, the Fumal pegmatite, Nazareno, Minas Gerais, Brazil, oxycalciomicrolite was found in the saprolite of the weathered pegmatite. It occurs as an accessory mineral associated with quartz, albite, microcline, muscovite, columbite, cassiterite, hematite, ilmenite, monazite-(Ce), xenotime-(Y), zircon, beryl, spinel, epidote and garnet. Oxycalciomicrolite is found as octahedral crystals, occasionally modified to rhombododecahedra, ranging from 0.2 to 0.5 mm in size. The crystals are brownish yellow to brownish red and translucent (MM 84.6.854-858).
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