mineral
Red Jasper
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mohs hardness 6.5 to 7; opaque pinkish-red to brownish-red color; vitreous to dull luster; microcrystalline/trigonal structure; conchoidal fracture with no cleavage; specific gravity ~2.65.
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Physical properties
Mohs hardness 6.5 to 7; opaque pinkish-red to brownish-red color; vitreous to dull luster; microcrystalline/trigonal structure; conchoidal fracture with no cleavage; specific gravity ~2.65.
Formation & geological history
Forms when silica-rich fluids precipitate within volcanic rock cavities, fissures, or sedimentary layers, taking on a red hue due to fine particles of hematite or iron oxides integrated during crystallization.
Uses & applications
Widely used in lapidary work, cabochons, carved ornaments, tumbled stones for crystal healing, bead jewelry, and decorative crafts.
Geological facts
Red Jasper has been prized since antiquity, used in ancient Minoan seals, Egyptian amulets, and traditional gemstone carvings. Its rich red color is directly caused by iron micro-inclusions.
Field identification & locations
Identified by its rich red color, high hardness, opacity, and smooth, polished or tumbled texture. Commonly found in Brazil, South Africa, Madagascar, India, and North America.
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