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Calcite : CaCO3, Goethite : α-Fe3+O(OH)

 
 
minID: W2U-FM0

Calcite : CaCO3, Goethite : α-Fe3+O(OH)

This image has been released to the public domain and may be used freely.

A couple of twinned rhombehedral groups of calcite with oxidized goethite in the highly altered orange andesite. The area's also good for siderite roses/stacks with frosty calcite rhombs. The one in front is 3 in. between points. Taken quickly as a mineral rescue operation was underway with the excavator coming 'tomorrow'. end of 2003

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Photo added: 13th Nov 2009