mineral
Polished brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide-rich matrix and possible chalcedony
AI-generated identification · may be incorrectOpaque, rounded tumbled stone with reddish-brown, gray-green, and cream angular veining; typically Mohs 6.5–7, waxy to vitreous luster, no visible cleavage, cryptocrystalline quartz structure, and specific gravity about 2.6–2.7.
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Physical properties
Opaque, rounded tumbled stone with reddish-brown, gray-green, and cream angular veining; typically Mohs 6.5–7, waxy to vitreous luster, no visible cleavage, cryptocrystalline quartz structure, and specific gravity about 2.6–2.7.
Formation & geological history
Forms when silica-rich fluids cement fragmented volcanic or sedimentary material, with iron oxides producing red-brown coloration; exact geological age and locality cannot be determined from the photograph.
Uses & applications
Used for cabochons, beads, carvings, tumbling, and ornamental objects; too small for construction use.
Geological facts
The contrasting angular patches indicate brecciation, while the metallic-looking brown areas are likely hematite or limonite staining rather than metal. Jasper is a variety of opaque chalcedony-rich quartz.
Field identification & locations
Identify by its glassy/waxy polish, lack of cleavage, hardness, and resistance to scratching by steel; common sources include India, Madagascar, Brazil, Australia, and the western United States.
