Dims: 1.3 x 0.9 x 0.8" (3.3 x 2.2 x 2.0 cm)
Wt: 12 g
Rossing Mine, Swakopmund District, Namibia
A few small sprays of tiny, radiating Boltwoodite crystals rest on the calcareous base of this thumbnail piece. Two of these sprays are larger than the rest, measuring 0.1" (3 mm) and 0.2" (5 mm) in diameter, respectively, and are in excellent condition. The others are either much smaller or are damaged. All contain fine, monoclinic needles that have the standard yellow color and silky luster. They rest on a bed of dogtooth calcite crystals that coat a base of calcite and shale. A standard Geiger-muller radiation counter will react readily to this piece.