mineral

Tumbled blue-gray mineral specimen

Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone

AI-generated identification · may be incorrect

Dark blue-gray, opaque, rounded and polished with scattered reflective grains or pits; hardness cannot be determined reliably from the image. The apparent granular texture suggests a crystalline aggregate rather than glass.

Identified August 13, 2026More mineral →

Explore Tumbled blue-gray mineral specimen in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely a naturally occurring mineral aggregate that has been cut and tumbled; exact formation and geological age depend on identification. Blue-gray specimens of this type commonly form in igneous or metamorphic rocks.

Uses & applications

Used mainly as a pocket stone, cabochon, or lapidary/collecting material; value is generally modest unless the material proves to be a scarce gem variety.

Geological facts

The image is too blurred for confident species identification. A streak test, hardness test, translucency check, and examination of fresh surfaces would distinguish likely candidates.

Field identification & locations

Look for uniform blue color, grain boundaries, natural fractures, and a nonmetallic luster; compare hardness with a steel blade and glass, avoiding damage to valuable specimens. Similar material occurs in Brazil, India, Canada, Russia, and the United States.