mineral
Tumbled pale brown stone, possibly petrified wood or chalcedony
Indeterminate from image; likely microcrystalline quartz (SiO₂) or silicified wood
AI-generated identification · may be incorrectSmall polished/tumbled specimen with cream, tan, and brown swirled banding; dull-to-waxy luster and no visible crystal faces. Quartz varieties have Mohs hardness about 7, conchoidal fracture, and specific gravity near 2.6; the image is insufficient to confirm hardness or cleavage.
Identified More mineral →
Explore Tumbled pale brown stone, possibly petrified wood or chalcedony in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small polished/tumbled specimen with cream, tan, and brown swirled banding; dull-to-waxy luster and no visible crystal faces. Quartz varieties have Mohs hardness about 7, conchoidal fracture, and specific gravity near 2.6; the image is insufficient to confirm hardness or cleavage.
Formation & geological history
If chalcedony, it formed when silica-rich groundwater filled cavities or fractures, commonly in volcanic rocks; if petrified wood, silica replaced organic tissue during burial. Age could range from recent to hundreds of millions of years, depending on locality.
Uses & applications
Used mainly as a decorative tumbled stone, cabochon, or small collectible; generally little industrial value at this size.
Geological facts
The curved internal markings may represent agate-like banding or wood grain, but blur and scale prevent reliable identification.
Field identification & locations
Test hardness against glass, inspect with magnification for wood-cell structure or concentric bands, and check translucency; common sources include Brazil, Madagascar, Indonesia, and the western United States.
