This is a most unusual specimen, which I call "fire and grass," that they purchased in Namibia in 1987. the leftmost third of the specimen is included by bright green duftite and the rightmost 2/3 by ruddy red-orange hematite, with very little admixture in-between. I have never seen another piece like this from Tsumeb, with such a mix. The luster, as you can tell, is phenomenal and the piece is near pristine. One of my personal calcite favorites! 12 x 11 x 7 cm