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reddish to browns
consisting of opaque rust to red glass with tiny flecks of glittering copper suspended within it
rainbow effect of light refracting off of the air bubbles inside of the stone
Its name is derived from the Greek word for blood
there may not be a more beautiful blue-and-brown combination than that of Terra Agate
Black Spinel 3mm Natural Round - 15-16 Inch Strawberry Quartz reddish to brownsSpinel 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.