Black Spinel 20x25mm Faceted Nugget Pendant Gem The inclusions are of manganese

The inclusions are of manganese or iron

It has also been considered a sacred stone in India throughout its history

This later combined with additional silica in the groundwater as well as the minerals that give Mookaite its distinctive colors

Blue Crazy Lace Agate is actually Mexican Crazy Lace Agate that has been color enhanced with blue to bring out the beautiful patterns in the stone

among other numerous names

Black Spinel 20x25mm Faceted Nugget Pendant Gem The inclusions are of manganeseSpinel 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.