mineral

Orange calcite pieces on blue calcite or aragonite matrix

Calcite, CaCO₃; blue coloration likely trace-element-bearing calcite (possibly aragonite)

AI-generated identification · may be incorrect

Orange pieces are translucent to opaque, with vitreous to waxy luster and likely Mohs hardness 3; calcite has rhombohedral cleavage and strong fizzing in dilute hydrochloric acid. The blue matrix is softer carbonate material with cloudy banding; the image is too blurred for definitive identification.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Carbonate minerals precipitate from hydrothermal fluids, caves, or sedimentary environments; orange coloration commonly reflects iron or other impurities. Age depends on locality, ranging from recent cavity growth to ancient sedimentary or hydrothermal deposits.

Uses & applications

Used as collector specimens, ornamental stone, and occasionally as industrial calcium-carbonate feedstock; blue calcite is mainly decorative rather than a gemstone.

Geological facts

Calcite is strongly birefringent, producing a doubled image through clear crystals, and is one of the most common minerals on Earth.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid effervescence; orange calcite commonly occurs in Mexico, Brazil, and parts of the United States. A locality label or hardness/acid tests are needed to distinguish it from orange aragonite or dyed material.