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Heliotrope
Gemstone
The mineral aggregate heliotrope, also known as bloodstone or ematille, is a cryptocrystalline mixture of [quartz] that occurs mostly as jasper or sometimes as chalcedony. The "classic" bloodstone is opaque green jasper with red inclusions of... Wikipedia
Crystal system: Trigonal
Formula (repeating unit): SiO2 (silicon dioxide)
Luster: Vitreous
Specific gravity: 2.61
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The second birthstone for March is bloodstone, a dark-green gemstone flecked with vivid red spots of iron oxide. Generally found embedded in rocks or ...
Bloodstone is a type of chalcedony. The amount of chlorite particles affects how green the stone is. The red spots—which resemble blood—come from iron oxide.