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G. Pseudomorph of hydrothermal biotite after a phenocryst of magmatic ferromagnesian mineral. Identification of the original mineral is no longer possible by visual means. Patchwork texture consisting of an aggregate of tiny flakes of biotite and myriad crystals of an opaque mineral. One small crystal of sphene is present just to the left of the larger opaque inclusion. The field of view is about 2 x 3 mm. Plane-polar light. DDH 345-468
