This is a fine, dramatic and probably old large cabinet specimen of calcite on amethyst from the ancient workings of quartz in Idar-Oberstein, used for centuries for carving and lapidary art. Still today, the world center of the highest end of the lapidary crafts is based in Idar-Oberstein, though stone to work on is now imported from elsewhere. This is a striking and beautiful pocket in basalt of lightly hematite-tinted amethyst crystals hosting a dense cluster of glassy, colorless calcite crystals to 2.5 cm. Ex. Richard Hauck Quartz Collection.