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Turquoise is a naturally soft stone
Pietersite is composed of
Phillipine Rosewood
Abalone Shell is strong and is made of stacked calcium carbonate tiles
Black Spinel 4x6mm Irregular Rondelle Faceted - 15-16 Inch 68221 Turquoise is a naturally softSpinel 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.
