Armalcolite : (Mg,Fe2+)Ti2O5

Copyright © Tony Peterson
minID: NRR-AG0

Armalcolite : (Mg,Fe2+)Ti2O5

Copyright © Tony Peterson  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 0.5 mm
Largest Crystal Size: 0.2 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.

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Photo added: 27th Dec 2009

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