An outcrop of rhombic calcite crystals, most visible above left of the hammer handle.
Crystal plates chipped out of these boulders fluoresce red, (calcite), yellow-white (caliche), and green (unknown). 8"x5"x2" There were literally thousands of crystalline calcite rocks at this quarry, but these were the only ones with a fluorescent response.
The purple-pink tones on the left side of the specimen are lamp reflection over the red.
Same specimen, white light.
Calcite (red), caliche (yellow), and gray-blue unknown mineral. 9"x5"x2"
Same specimen, white light.
Well-formed calcite crystals (red), with yellow caliche. 4"x3"x2"
Same, white light. The large crystal in the center measures 0.5"x1".
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