metamorphic
Polished black-and-pink patterned stone, likely jasper or brecciated jasper
Jasper (microcrystalline quartz, SiO₂), possibly brecciated or polymict jasper with iron-oxide inclusions
AI-generated identification · may be incorrectOpaque, fine-grained, glassy-to-waxy luster, irregular polished surface, black/gray matrix with pink areas and reflective mineral patches; hardness about 6.5–7 Mohs, no visible cleavage, specific gravity roughly 2.6.
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Physical properties
Opaque, fine-grained, glassy-to-waxy luster, irregular polished surface, black/gray matrix with pink areas and reflective mineral patches; hardness about 6.5–7 Mohs, no visible cleavage, specific gravity roughly 2.6.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or fractures; pink coloration commonly comes from hematite or related iron oxides. Exact age and locality cannot be determined from the photograph.
Uses & applications
Used for cabochons, beads, tumbled stones, carvings, and ornamental objects; attractive polished pieces commonly sell for modest prices.
Geological facts
The specimen appears polished or tumbled rather than naturally weathered. Reflective spots may be quartz, mica, or metallic-looking iron oxides, but the image is insufficient for a precise identification.
Field identification & locations
Test hardness against glass, inspect a fresh edge for quartz-like translucency, and check streak and magnetism; jasper is generally nonmagnetic and leaves no streak on unglazed porcelain. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.
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