Dims: 2.64x2.56x2.32" (6.7x6.5x5.9cm)
Wt: 8.78oz (248.4g)
Mt. Cobalt, Queensland, Autralia
Erythrite nearly covers the host rock of this specimen. All of it is in the form of radiating acicular crystals with the characteristic purple-red color, but most of the crystals were growth-constrained, and look like simple crusts until examined with a loupe which reveals a mat of acicular crystals. In several protected areas, the erythrite forms spherical clusters of crystals, and the color appears significantly darker in these places, as you are seeing crystals head-on, instead of the side views that reflect more light. There are also a few areas where the erythrite appears to have formed a druze of rounded transparent crystals, with a slightly darker color and with a melted-wax luster, not unlike smithsonite. This may not be erythrite, although the color is the same, and I suspect it is just an unusual habit.