Tochilinite with Dolomite and Uranopyrochlore
Jacupiranga mine, Jacupiranga, Sao Paulo, Brazil
Miniature, 4.5 x 4.0 x 2.0 cm
Ex. Paulo Matioli
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Grayish-white, coarse-grained dolomite matrix with minor magnesite hosts interstitial, black to bronze tochilinite crystals and clusters up to 1mm. A few dark equant "uranpyrochlore" (of Hogarth, 1977) crystals are scattered in the carbonate matrix. Tochilinite is a rare iron magnesium oxysulfide! Ex. Paulo Matioli collection.