Black Spinel 15-20mm Double Drill Puff Hexagon - 8 Inch R1757 an opaque silicon dioxide mineral

an opaque silicon dioxide mineral and form of microcrystalline Chalcedony

each specimen will vary in size and shape

or some degree of pink in between

The special stainless steel head of MultiPliers feature double leaf-spring loaded handles and combines a set of Round Nose and Chain Nose Pliers that move simultaneously

AKA- Amazon Stone

Black Spinel 15-20mm Double Drill Puff Hexagon - 8 Inch R1757 an opaque silicon dioxide mineralSpinel 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.