mineral

Polished banded calcite (often sold as “green onyx” or “Pakistan onyx”); likely a carved calcite egg

Calcite, CaCO₃; banded variety commonly called onyx marble

AI-generated identification · may be incorrect

Translucent green, cream, and honey-brown bands with a vitreous-to-waxy polish; trigonal crystal structure, Mohs hardness 3, perfect rhombohedral cleavage, specific gravity about 2.7. The image alone cannot confirm the exact mineral or any treatment.

Identified October 3, 2026More mineral →

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At a glance

Common name: Polished banded calcite (often sold as “green onyx” or “Pakistan onyx”); likely a carved calcite egg
Scientific name: Calcite, CaCO₃; banded variety commonly called onyx marble
Category: mineral
Identified: October 3, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 USD for a polished egg of this apparent size and finish; price varies with size, polish, and provenance.

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

Forms as layered calcite deposited from mineral-rich waters in caves or springs, commonly in Cenozoic deposits; iron and other impurities produce the colors. The specimen has been cut and polished.

Uses & applications

Decorative carvings, ornaments, and small interior accents; too soft for durable everyday jewelry or high-wear surfaces.

Geological facts

Commercial “green onyx” is often banded calcite, not true silica onyx (chalcedony). Calcite fizzes in dilute acid and is readily scratched by a steel point.

Field identification & locations

Look for translucent, curved or wavy color bands and test hardness cautiously; genuine calcite is softer than glass. Decorative calcite is widely quarried in Pakistan and other regions.