mineral
Polished brecciated jasper (likely)
Brecciated jasper, an opaque microcrystalline quartz (SiO₂) with contrasting silica-rich fragments and matrix
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; mottled gray, mauve, cream, and dark patches with a polished, waxy-to-glassy luster. Quartz is trigonal and lacks cleavage; the visible angular fragments suggest a brecciated texture. The exact identification is uncertain from the image alone.
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Physical properties
Hardness about 6.5–7 Mohs; mottled gray, mauve, cream, and dark patches with a polished, waxy-to-glassy luster. Quartz is trigonal and lacks cleavage; the visible angular fragments suggest a brecciated texture. The exact identification is uncertain from the image alone.
Formation & geological history
Silica-rich fluids or sediments filled and cemented fractures in older rock, later silicifying the fragments. Jasper deposits form in varied geological settings and may be of many ages.
Uses & applications
Used for beads, cabochons, ornaments, and lapidary pieces; not usually valued as an industrial stone.
Geological facts
“Brecciated” describes angular rock fragments cemented together; polishing emphasizes the contrasting fragments and matrix.
Field identification & locations
Look for opaque, hard material with angular contrasting patches and a smooth polish; quartz-rich jasper occurs worldwide. A close-up or hardness test would help distinguish it from other polished breccias.
