smooth enough to hold without thinking about it

so handle it with care

cut into a heart—pale and translucent at the edges

Three blue minerals from three different families—each one blue for a different reason

Its locality-specific rarity gives it standing among serious crystal collectors

Black Tourmaline Point Polished Bell Rock smooth enough to hold withoutA polished point cut from one of the most electrically active minerals knownTourmaline generates a measurable charge when compressed or heated. Black Tourmaline (Schorl) is a boron silicate, Mohs 77. 5, and a genuinely piezoelectric and pyroelectric mineral: it generates an electric charge under mechanical pressure and temperature change, a property applied in pressure gauges and other scientific instruments. Its black color reflects high iron