Prehnite 3x4mm Rondelle Faceted A Grade - 15-16 Inch

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Prehnite 3x4mm Rondelle Faceted A Grade - 15-16 InchPrehnite 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.

and it can be mottled or striated with veins of these colors

A variety of Andalusite

Moroccan Agate is a variety of Chalcedony

ochre browns and deep greens

Labradorite is usually gray to green

especially public speaking

and much of the black Onyx on the market has been artificially colored

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It was first found in a deposit near Shunga village

Porcelain Agate is a natural agate that is dyed and heated to give it the unique blue/white color and pattern that resembles porcelain

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and it is known to have been widely used in Aztec and Native American cultures