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which may contain iron oxide
Onyx is a black and white banded Chalcedony
It is not a granite
These stones have unique green pigmentation when compared to other turquoise sourced from the region
Prehnite 12x16-18x25mm Jagged Rough Collar hps_06252026 which may contain iron oxidePrehnite 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.