Black Spinel 10mm Natural Round - 15-16 Inch Shape_Irregular Rondelle Carnelian is a glassy

Carnelian is a glassy

after its type locality

Crystal Quartz is a naturally occurring clear and colorless Quartz

yellow to green or sea to green in color

Black Spinel 10mm Natural Round - 15-16 Inch Shape_Irregular Rondelle Carnelian is a glassySpinel 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.