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Orthoceras was an ancient mollusk that lived over 370 million years ago
Shungite is a black
periwinkle
where copper contributes to blue tones and iron introduces green variations
It is the most abundant lithium-bearing mineral as well as a significant source of the rare alkali metals rubidium and caesium
Prehnite 6mm Coin Faceted A Grade - 15-16 Inch HPS10282022 Orthoceras was an ancient molluskPrehnite 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.
US$ 1999.50
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