mineral
Tumbled honey-brown quartz pebble
Quartz, SiO₂; likely iron-stained quartz or chalcedony
AI-generated identification · may be incorrectTranslucent brown-orange with a vitreous to slightly waxy luster and rounded, tumbled surface. Quartz has Mohs hardness 7 and a trigonal crystal structure; it lacks cleavage and has conchoidal fracture. Specific gravity is about 2.65.
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Physical properties
Translucent brown-orange with a vitreous to slightly waxy luster and rounded, tumbled surface. Quartz has Mohs hardness 7 and a trigonal crystal structure; it lacks cleavage and has conchoidal fracture. Specific gravity is about 2.65.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma, and chalcedony forms as microcrystalline silica. The pebble’s rounded shape indicates transport and abrasion; its precise geological age and source cannot be determined from the image.
Uses & applications
Commonly used in jewelry, ornaments, and mineral collections; quartz is also important in glassmaking and electronics.
Geological facts
Iron-oxide staining can produce warm yellow, orange, and brown hues in otherwise colorless quartz.
Field identification & locations
Look for hardness, glassy luster, and conchoidal fracture; its rounded form suggests a water-worn pebble later polished. Quartz is widespread worldwide, especially in veins and river gravels.
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