Dims: 1.7" x 1.4" x 1.1" (4.3 x 3.6 x 2.8 cm)
Wt: 20.6 g
Bashen Quarry, Waddamana, Tasmania, Australia
This small specimen consists of a crust of intergrown Chabazite crystals that started to form a few small "outcroppings". The crystals that make up the crust reach maximum dimensions of 0.4 x 0.3 x 0.2" (1.0 x 0.8 x 0.5 cm), and are in very good condition, showing moderate damage. Their trigonal prismatic form is quite unusual, as all of the crystals have taken on a trigonal dipyramidal form; the pyramids are quite shallow, making me want to call them "trigonal tabular". Even with their intense intergrowth, this form is quite evident. There seem to be some definite planes of symmetry visible that suggest twinning. The crystals' edges are slightly rounded but still easily definable, and their faces are smooth and show a bright, pearly luster. All have a milky-white coloration that is caused by intense internal fracturing, which also spoils their clarity. There is no host rock or other material on the specimen- it is made up entirely of Chabazite.