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iron or manganese imperfections
A cryptocrystalline Chalcedony
including lazurite
It is considered a precious Opal
which may form green stains or specks on Azurite crystals or aggregates
Multi Spinel 2mm Faceted Round AA Grade - 15-16 Inch shell iron or manganese imperfectionsSpinel 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.
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