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4 Inches / 40x60mm / 4x6cm
It is the most abundant lithium-bearing mineral as well as a significant source of the rare alkali metals rubidium and caesium
The deposits within the rock become Turquoise after a chemical reaction occurs over long periods of time
Mined in: Madagascar
Weight: grams: 160-210 grams
Prehnite 6mm Round Faceted A Grade - 15-16 Inch 8x10 Tumble Nugget 4 Inches / 40x60mm /Prehnite 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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