mineral

Tumbled light-colored stone, possibly quartz or agate

Undetermined; likely microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Smooth, polished/tumbled pebble with pale gray-white color and dark natural-looking markings; likely vitreous to waxy luster and hardness about 6.5–7 Mohs. The image is too blurred to confirm crystal structure, cleavage, or specific gravity.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

If quartz-rich, it formed through silica precipitation or weathering and later became rounded naturally or in a tumbler; its geological age and locality cannot be determined visually.

Uses & applications

Commonly used as a decorative tumbled stone, craft material, or inexpensive jewelry component.

Geological facts

The dark lines may be mineral inclusions, fractures, or surface veins; similar appearance can occur in quartzite, agate, jasper, or dyed stone.

Field identification & locations

Test uncoated areas for hardness against glass, inspect translucency, and use a 10× loupe; definitive identification requires streak, specific gravity, and possibly chemical testing. Common sources include Brazil, Uruguay, India, Madagascar, and the western United States.