Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm ” Tourmaline is unusual in

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

originally from the Lapis-Lazuli mine in Afghanistan

Rhodonite belongs to the Pyroxenoid group of minerals

The first rough material was offered for sale in Tucson in 2011 and is now regularly mined at the remote deposit site in Sonora

this unique and earthy Petrified Wood Agate slab specimen is perfect for gift giving or keep for yourself

Black Spinel 9x13mm Twisted Drop - 8 Inch 3mm ” Tourmaline is unusual inSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.