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Armalcolite

Locality: Smoky Butte (Smoky Butte Lamproite), Garfield Co., Montana, USA

FOV=0.5 mm. Armalcolite is present as black, metallic rectangular prisms and needles. The photo is of a naturally weathered surface of a phlogopite-sanidine-leucite lamproite lava, revealing the mechanically resistant armalcolite crystals. The lava is non-vesicular so there were no void spaces for crystals to grow into - this is the only means to observe unbroken armalcolites in this rock, aside from severe chemical dissolution. Collection and photo, T. Peterson.

SEM/backscattered electron and thin section images have been uploaded separately.

This photo has been shown 2012 times

Photo added: 27th Dec 2009

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