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which refers to a "precious blue-green color-of-sea-water stone
red and gray in swirling circular patterns
it is made up of volcanic glass
phlogopite
The image shown has multiple cabochons to give you an idea of the range possibilites of the colors
Prehnite 10x14-13x17mm Faceted Tumble Nugget - 15-16 Inch hps_08152024 which refers to a "preciousPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.
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