sedimentary

Likely calcite-rich limestone

Calcite (CaCO₃), possibly recrystallized limestone

AI-generated identification · may be incorrect

Cream to honey-yellow, opaque and irregularly fractured with a dull-to-waxy surface. Calcite has Mohs hardness 3, trigonal crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.7; the image alone cannot confirm its composition.

Identified October 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Limestone forms from accumulated carbonate sediments or shells, commonly in warm marine settings; geological age is undetermined. A crystalline appearance may indicate later recrystallization into marble, which would be metamorphic.

Uses & applications

Limestone is used for cement, lime, aggregate, and building stone; calcite specimens are collected and sometimes used decoratively.

Geological facts

A drop of dilute acid should fizz on calcite-rich material. Hardness and cleavage tests can help distinguish it from quartz or feldspar.

Field identification & locations

The pale, massive appearance is consistent with carbonate rock, but identification from a photograph is uncertain. Carbonate rocks occur worldwide; estimated value is about $1–$10 for a common hand specimen.