High Quality Content by WIKIPEDIA articles! Rameauite is a uranium oxide mineral with formula K2Ca(UO2)6OH16·H2O or K2CaU6+6O20·9(H2O). It was first described in 1972 for an occurrence in the Margnac Mine, Compreignac, Haute-Vienne, Limousin, France and named for the French prospector who discovered the mine, Jacques Rameau. Rameauite occurs as small orange crystals with calcite and ex-uranophane on a block of pitchblende. They are all twinned on {100}, slightly flattened parallel to {010}, elongated parallel to [001], with a pseudo-hexagonal section. The observed forms are {010}, {100}, {001},and {110}; measured (100): (001) = 58°40', (010):(110) = 49° 50'. There is a good cleavage parallel to {010}. Rameauite is monoclinic pseudo-hexagonal with a= 13'97, b= 14'26, c= 14'22 A.

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