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The inclusions are of manganese or iron
rainbow effect of light refracting off of the air bubbles inside of the stone
Tiger Eye is a macrocrystalline Quartz stone with bands of rich golds and browns
In this strand
This variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns
Black Spinel 3mm Faceted Round - 15-16 Inch 0.8 - 1.1mm 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.