mineral

Tumbled milky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent cream-white pebble with yellow-orange iron-oxide staining and a waxy to vitreous polish. Mohs hardness 7; no cleavage, conchoidal fracture; trigonal crystal structure; specific gravity about 2.65.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids in veins or as a component of weathered metamorphic/igneous rocks. The rounded shape appears naturally water-worn or mechanically tumbled; iron staining developed during weathering. Exact geological age cannot be determined from the photograph.

Uses & applications

Common as a decorative tumbled stone, lapidary material, and inexpensive cabochon or craft stone; not usually a high-value gemstone.

Geological facts

The yellow coloration is probably limonite/goethite coating or inclusions rather than the quartz itself. A steel file should not easily scratch it, while quartz should scratch ordinary glass.

Field identification & locations

Common quartz is plausible near Agra, Uttar Pradesh, where alluvial sediments and weathered transported stones occur, though the source rock cannot be identified from this pebble alone. Test hardness and inspect a freshly chipped area for glassy fracture; acid testing is unnecessary.