I do not know whether to call this calcite on mimetite or mimetite on calcite. Whatever the case - what you have here are intergrown rhombs of calcite and balls of yellow mimetite! You can see the rust-hued accents from the limonite as well. A fascinating old Santa Eulalia combo specimen! 7.9 x 4.4 x 3.4cm
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Photo added: 10th Apr 2006