mineral
Polished bloodstone (heliotrope)
Chalcedony, microcrystalline SiO₂, with green coloring and iron-oxide inclusions
AI-generated identification · may be incorrectLikely a tumbled, polished specimen with a glossy luster and mottled dark-green, brown, and reddish areas. Quartz hardness is about 6.5–7 Mohs; the microscopic crystals are too fine to distinguish, and cleavage is absent.
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Physical properties
Likely a tumbled, polished specimen with a glossy luster and mottled dark-green, brown, and reddish areas. Quartz hardness is about 6.5–7 Mohs; the microscopic crystals are too fine to distinguish, and cleavage is absent.
Formation & geological history
Bloodstone forms as iron-bearing silica deposits in cavities and fractures, later hardened into chalcedony; specimens may come from ancient volcanic or sedimentary settings. The image does not establish its geological age or exact variety.
Uses & applications
Used for beads, carvings, cabochons, and inexpensive jewelry or collectibles.
Geological facts
Classic bloodstone typically has a deep-green body with distinct red iron-oxide spots; this specimen’s pattern is subdued, so identification from the photo is uncertain.
Field identification & locations
Check for a very hard, waxy-to-glassy surface and red flecks within green chalcedony; common sources include India, Brazil, and Australia. Similar-looking jasper or other tumbled stones are possible.
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