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Black Eye Agate is a variety of Sardonyx which has a Sard base
The presence of Manganese within the stone produces the purple hue
Red Lightning Agate is predominantly red with swirls and mottling of green
Madagascar
Like all obsidian
Prehnite 12x16-18x25mm Jagged Rough Collar hps_06252026 Black Eye Agate is aPrehnite 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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