mineral

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

AI-generated identification · may be incorrect

White, translucent, bladed to rhombohedral crystals form a crust around green, pink, and brown matrix. Calcite has Mohs hardness 3, vitreous to pearly luster, rhombohedral cleavage, and effervesces in dilute acid; fluorite is harder (Mohs 4), commonly cubic, and may fluoresce under UV light.

Identified August 10, 2026More mineral →

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At a glance

Common name: Calcite–fluorite mineral specimen with iron-oxide staining
Scientific name: Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

Approximately $20–$100 for a common hand specimen; $150–$500+ if crystals are unusually sharp, fluorescent, or from a desirable 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

Likely a hydrothermal vein specimen formed when mineral-rich fluids deposited carbonate and fluorite in fractures, with later oxidation producing the reddish-brown staining. Exact age and locality cannot be determined from the image.

Uses & applications

Primarily a collector specimen; calcite and fluorite are important industrial minerals used in cement, lime, steelmaking, optics, and chemical processing.

Geological facts

The contrasting green, pink, white, and rusty colors probably reflect multiple mineral phases rather than a single colored mineral.

Field identification & locations

Look for calcite cleavage and acid reaction, fluorite’s cubic cleavage or UV fluorescence, and possible quartz’s glassy, non-cleaving grains. Common sources include Mexico, China, the United States, and Morocco.