mineral

Green calcite-bearing rock (likely calcite on a pale matrix)

Calcite, CaCO₃; exact matrix and green coloring cannot be determined from the image

AI-generated identification · may be incorrect

Pale mint-green, rough, partly translucent crystalline material on a light-colored matrix, with a small rusty-brown stain. Calcite has Mohs hardness 3, vitreous luster, and trigonal crystal structure; it fizzes in dilute acid and cleaves readily into rhombohedra.

Identified September 28, 2026More mineral →

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At a glance

Common name: Green calcite-bearing rock (likely calcite on a pale matrix)
Scientific name: Calcite, CaCO₃; exact matrix and green coloring cannot be determined from the image
Category: mineral
Identified: September 28, 2026
Method: Standard

AI Estimated Value

Approximately $2–$20 USD for a small, common rough specimen; value depends on confirmed identity, size, and appearance.

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

Calcite commonly forms by precipitation from groundwater or hydrothermal fluids and in sedimentary settings; the specimen’s age and specific formation environment are unknown.

Uses & applications

Calcite is used in cement, lime, soil treatment, and as a decorative or collectible mineral; this rough piece appears primarily suitable for collecting.

Geological facts

Green color may result from trace impurities or inclusions; color alone is not diagnostic of calcite.

Field identification & locations

Look for softness, rhombohedral cleavage, and acid reaction to distinguish calcite from harder green minerals. Calcite occurs worldwide in sedimentary rocks, veins, and cavities; confirm identification before handling or pricing.