sedimentary

Likely pale limestone or calcite-rich rock

Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Off-white, dull to slightly earthy luster, irregular fracture, and apparently fine-grained/massive texture. Calcite has Mohs hardness 3; limestone typically has specific gravity about 2.3–2.7 and reacts vigorously with dilute hydrochloric acid or vinegar if powdered.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Most likely lithified marine or freshwater carbonate sediment, formed by accumulation and cementation of shells or carbonate mud; age cannot be determined from the photograph. The reported location in northern Guatemala is consistent with abundant limestone bedrock.

Uses & applications

Used for crushed stone, cement, lime, aggregate, and building material; attractive pieces may be collected, though this specimen appears low-grade and unpolished.

Geological facts

The image does not show diagnostic crystals or fossils, so identification is provisional. It could also be a weathered calcite-rich fragment or chalky carbonate rock.

Field identification & locations

Test a fresh surface with dilute acid or vinegar: fizzing supports calcite/limestone. Limestone is common in the Petén and Maya Mountains region of Guatemala and Belize; avoid mistaking pale concrete or plaster for natural rock.