Specimens with a high uranium content are typically metamict and appear coated with a yellow brown earthy rind

This is a fabulous specimen of bladed kyanite and quartz mined in Barra do Salinas district

Quebec Canada

Color: Rich Pigeon Blood Red

This is a nice 6

Cassiterite Crystals | Black | Lot in a Jar | Tin Gulch, Grant Co. | New Mexico | SO24 Impactite-in-a-Box Specimens with a high uraniumMost cassiterite crystals have opaque, dark colors, usually black or brown. Lighter colored, facetable crystals are much rarer and usually occur in small fragments. With a dispersion or fire almost twice that of diamond as well as vitreous to adamantine luster, transparency, and a hardness of 6 7, faceted cassiterites would make good jewelry stones. Cassiterite is a durable gemstone with tremendous dispersive fire, especially visible in properly cut