Dims: 2.3" x 1.1" x 1.0" (5.8 x 2.8 x 2.5 cm)
Wt: 1.11 oz. (31.5 g)
Ojuela Mine, Mapimi, Durango, Mexico
This large thumbnail specimen consists of a thin crust of bright-green conichalcite that coats a portion of a goethite/limonite host rock. The crust shows many small but definite botryoidal formations, and is opaque and has a dull luster. It appears to sparkle, however, because the thin crust is mostly coated with tiny trigonal "dogtooth" calcite crystals. These crystals show almost no damage, are seemingly transparent, and have a bright, pearly-to-vitreous luster. These crystals are highly concentrated at one end of the crust, so as to completely obscure its visible botryoidal tendencies. Close examination with a loupe or magnifier shows a wonderful tiny world made up of round green balls and sharp, shiny spikes, but at least 30x magnification is recommended for the best effect.