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An antimonian idocrase from the Bau mining district, Sarawak, Malaysia

A ROCK specimen, K.I32, containing radiating aggregates of pale-green prismatic crystals, was submitted for confirmation of the green mineral as idocrase by E. B. Wolfenden, Geological Survey, Borneo Region, Malaysia. The specimen was collected from an ore-body that forms a lens in marble adjacent to a hydrothermally altered porphyry dyke. The ore is described as rich in stibnite, containing abundant wollastonite and locally much epidote, in addition to quartz and calcite. An X-ray diffraction photograph confirmed the green mineral as idocrase but its unusual optical properties warranted a more detailed examination.