Dims: 2.9" x 2.2" x 1.5" (7.4 x 5.6 x 3.8 cm)
Wt: 10.63 oz. (301.3 g)
Cananaea, Sonora, Mexico
This specimen consists of a cluster of scores of intergrown cubic Pyrite crystals. They are in generally good condition, though many crystals show visible damage or substantial breakage. Cubes range in size from a few millimeters to 0.4" (1.0 cm) along an edge. Their form is excellent, with very clean, smooth faces and sharp edges where intact. They have the standard pale gold color and metallic luster of this mineral. Upon first glance, the cluster appears to be entirely pure, but examination under magnification shows that many tiny patches of brown calcite and black sphalerite crystals are scattered about. There is even a small patch of actinolite needles visible that are ringed by some calcites. I have not seen many Pyrite specimens from Mexico that have crystals as good in quality as these.