mineral

Clear calcite crystal (likely Iceland spar)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Colorless to milky translucent, vitreous to pearly luster; trigonal crystal system and prominent rhombohedral cleavage. Mohs hardness 3; the rounded, reflective faces in the photo are consistent with calcite, though the image alone cannot confirm it.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms in veins, cavities, and sedimentary settings from calcium-carbonate-rich fluids; calcite occurs in rocks of many ages. The specimen’s specific age and formation setting cannot be determined from a photo.

Uses & applications

Used in cement and lime production, construction stone, and chemical applications; clear, well-formed crystals are collected and sometimes used decoratively.

Geological facts

A clear calcite crystal can split light into two images (double refraction); test only with a printed line, since hardness and cleavage tests can damage the specimen.

Field identification & locations

Calcite is common worldwide, including in Ethiopia’s varied geology. Check for rhombohedral cleavage and whether a line viewed through it appears doubled; vinegar fizz is a weaker carbonate check. The reported location is plausible, but cannot establish the identification.