Fazenda Guariba, Presidente Kubitschek, Minas Gerais, Brazil

4.5 x 3.6 x 2.4 cm
1.8 x 1.4 x 0.9 in

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Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈

Small crystals of lead bearing Crichtonite and scattered across the surface of heavily included Quartz. There is only larger Crichtonite crystals but it is crudely formed and may be partially damaged. After examination of the cleaved side of the Quartz, it can be conjectured that much of the gray color is due to micro inclusions of more Crichtonite which form a layer up to 6 mm in depth. Below this layer, the Quartz is quite transparent and glassy looking and contains other inclusions. The Quartz on the surface with the Crichtonite crystals has a high luster which is directional when viewed.

Condition: Good

Flaws: The largest crystal may either be incomplete or just crudely formed.

This mineral is also found in the following galleries: Minerals From Brazil | Oxides and Hydroxides | Rare Minerals | Minerals Priced Between 50 and 99 Dollars