Dims: 2.9" x 2.4" x 1.8" (7.4 x 6.1 x 4.6 cm)
Wt: 7.91 oz. (224.4 g)
Butte, Montana, U.S.A.
This specimen is made up mostly of intergrown Diopside crystals, almost all of which are intergrown and broken. There are a few hollows in one area of the host rock, however, and several complete and intact crystals are visible there. They achieve maximum dimensions of 0.4 x 0.2 x 0.2" (1.0 x 0.5 x 0.5 cm) and show a slightly rounded but definite monoclinic prismatic form that almost looks like a tetragonal dipyramid in a few of the crystals. Their color is a moderately pale green with a hint of gray and they show a pearly luster. A few may show some dim translucence, but they are, for the most part, opaque. The hollows that contain the intact crystals are mostly filled with amorphous, pale blue calcite- the intact Diopsides were enveloped by it after their formation, and were thus protected.