mineral
Red jasper-like chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
AI-generated identification · may be incorrectOpaque reddish-brown body with a pale cream edge and dull-to-waxy luster; quartz hardness is about Mohs 6.5–7, with no visible cleavage and a cryptocrystalline structure. The rounded form suggests natural or water-worn material, possibly lightly polished.
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Physical properties
Opaque reddish-brown body with a pale cream edge and dull-to-waxy luster; quartz hardness is about Mohs 6.5–7, with no visible cleavage and a cryptocrystalline structure. The rounded form suggests natural or water-worn material, possibly lightly polished.
Formation & geological history
Forms when silica-rich groundwater fills cavities or fractures, with iron oxides producing the red coloration; age depends on its host rock and cannot be determined from the photograph. Common in volcanic and sedimentary terrains.
Uses & applications
Used for cabochons, beads, carvings, tumbled stones, and decorative objects; attractive pieces have modest lapidary value.
Geological facts
Jasper is an opaque variety of chalcedony, while more translucent material is usually called chert or chalcedony. The pale rim may represent silica-rich weathering or host-rock material.
Field identification & locations
Identify by its waxy surface, very high hardness, opaque red color, and inability to scratch with a steel knife easily; a streak, hardness, and specific-gravity test would improve identification. Found worldwide, especially in iron-rich volcanic and sedimentary regions.
