Pyroxmangite
Nippyo mine, Awano, Kanuma City, Tochigi Prefecture, Japan
5.4 x 2.4 x 1.2 cm. A very rare specimen. This huge crystal would be large for the species from any locality, but particularly for this old Japanese classic locale it is of incredible size. I believe it to be twinned, as you can see from the unusual habit. When backlit, it is translucent and looks more gemmy and red.
© Rob Lavinsky & irocks.com