mineral
Tumbled light-colored stone, possibly quartz or agate
Undetermined; likely microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectSmooth, 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 More mineral →
Explore Tumbled light-colored stone, possibly quartz or agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
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.
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.
