Rock 366 : Day 276 : Chalcomenite and Umangite


Day 276 : Chalcomenite (copper selenium oxide; blue) and umangite (copper selenide; violet-red) from Sierra de Cacho, just to the west of the Sierra de Umango (from where the name incorrectly comes), La Rioja, Argentina. Cotton collection, Keele.


~ by hypocentre on October 27, 2012.

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