Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal It is a rare occurrence
Description
It is a rare occurrence to find gem-grade hackmanite
it has often been used as a substitute
it offers a way to work a neutral color into your designs
Unsealed granite may discolor when exposed to oil
a silicate of calcium and magnesium -- from western Canada
Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal It is a rare occurrencePrehnite 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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