mineral
Likely iron-stained quartz pebble
Quartz (SiO₂), possibly with iron-oxide staining
AI-generated identification · may be incorrectOpaque to translucent brown-gray, with a rough, weathered surface and glassy patches. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and a conchoidal fracture; the image alone does not confirm the identification.
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Physical properties
Opaque to translucent brown-gray, with a rough, weathered surface and glassy patches. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and a conchoidal fracture; the image alone does not confirm the identification.
Formation & geological history
Quartz forms in many igneous, metamorphic, and sedimentary settings; this rounded pebble was likely weathered from bedrock and transported by water. Its geological age and exact source cannot be determined from the image.
Uses & applications
Common quartz is used in glass, electronics, and as a collectible; this small rough specimen has little commercial value.
Geological facts
Brown coloration may come from iron oxides such as hematite or goethite coating or staining the quartz.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; a steel nail should not readily scratch quartz. Rounded shape suggests transport, but local geology is needed to narrow down where it was found.
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