metamorphic

Likely polished white-and-gray stone, possibly marble or quartzite

Uncertain from image; likely calcite-rich marble (CaCO₃) or quartzite (SiO₂)

AI-generated identification · may be incorrect

White, gray, and possibly greenish banding with a matte-to-slightly polished luster; apparent hardness is roughly Mohs 3–7 depending on composition. The rounded shape indicates tumbling or hand polishing; cleavage and crystal structure are not reliably visible.

Identified August 17, 2026More metamorphic →

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At a glance

Common name: Likely polished white-and-gray stone, possibly marble or quartzite
Scientific name: Uncertain from image; likely calcite-rich marble (CaCO₃) or quartzite (SiO₂)
Category: metamorphic
Identified: August 17, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a common tumbled specimen; $20–$75 if unusually attractive, large, or from a documented locality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

If marble, it formed when limestone recrystallized during metamorphism; if quartzite, sandstone recrystallized under heat and pressure. The specimen’s geological age and locality cannot be determined from the photograph.

Uses & applications

Commonly used as a decorative stone, lapidary material, cabochon, or carving stock; marble also has construction uses. A small tumbled piece generally has modest value.

Geological facts

The gray central band may be mineral-rich veining or a distinct lithologic layer, but visual identification alone is insufficient. A vinegar test can indicate calcite, while a steel-file or glass-scratch test helps distinguish softer marble from harder quartzite.

Field identification & locations

Check for fizzing in dilute hydrochloric acid or vinegar, streak, translucency, and hardness; laboratory testing or locality information is needed for a confident identification. Similar material occurs worldwide in metamorphic belts and commercial stone deposits.