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When the level of iron oxide is high
Its needle to like inclusions of hematite are iridescent red
Red Garnet and Crystal Quartz
” The orange color is attributed to the presence of hematite or goethite within the rock
Prehnite 8mm Round AAA Grade - 15-16 Inch AA Gade When the level of ironPrehnite 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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