Dims: 1.1 x 0.9 x 0.6" (2.8 x 2.3 x 1.5 cm)
Wt: 10.3 g
Saint Pierre Dome, El Paso County, Colorado, U.S.A.
Several portions of Thorite crystals are partly embedded in the host rock of this thumbnail specimen. All of these crystals are broken and incomplete, so much so that their tetragonal tabular form is impossible to determine (I would imagine that given this mineral's radioactivity, it would not form very definable crystals in the first place). They have a deep red-brown coloration and a dull matte luster, and are, of course, opaque. They rest in a dull, pale brown host rock that looks a lot like shale.