Black Spinel 8mm Round - 15-16 Inch Ocean Jasper and forms within a host

and forms within a host rock such as ironstone or sandstone

Ocean Jasper is a commercial name for Orbicular Jasper

Boulder Opal is a golden-brown to dark brown stone

between Topaz (8) and Corundum (9)

It displays a visual property called “pleochroism

Black Spinel 8mm Round - 15-16 Inch Ocean Jasper and forms within a hostSpinel 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.