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Porcelain Agate is a natural agate that is dyed and heated to give it the unique blue color and pattern that resembles porcelain
It has also been considered a sacred stone in India throughout its history
one of the first fluorescent minerals ever studied
It was named and first described by the Greek philosopher and botanist Theosphrastus in 315 BCE
A form of chalcedony made of quartz
Black Spinel 8mm Faceted Rondelle Large Hole (2-2.5mm) 8-Inch Dark Porcelain Agate is a naturalSpinel 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.
