Masuyite

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Masuyite
Masuyite-Uraninite-mun08rad-05b.jpg
Orange Masuyite coating crystals of cubic uraninite (to about 1 cm). Shinkolobwe mine, the type locality, Democratic Republic of the Congo.
General
Category Oxide minerals
Formula
(repeating unit)
Pb[(UO2)3O3(OH)2]·3H2O
Strunz classification 04.GB.35
Unit cell a = 13.98Å, b = 12.11Å, c = 14.2Å
Identification
Crystal system Orthorhombic
Optical properties Biaxial (-)
Refractive index nα = 1.785 nβ = 1.895 nγ = 1.915
Birefringence δ = 0.130
2V angle Measured: 50° , calculated: 44°
Dispersion extreme

Masuyite is a uranium/lead oxide mineral with formula Pb[(UO2)3O3(OH)2]·3H2O.[1]

Masuyite was first described in 1947 for an occurrence in Katanga and named to honor Belgian geologist Gustave Masuy (1905–1945).[2]

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