sedimentary

Limestone (Brecciated/Recrystallized)

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Gray to brownish-gray with earthy inclusions; Luster: Dull to sub-vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: Perfect rhombohedral in calcite grains; Specific Gravity: 2.5-2.7

Hardness: 3 on Mohs scale
Color: Gray to brownish-gray with earthy inclusions
Luster: Dull to sub-vitreous

Identified February 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of shell, coral, algal, and fecal debris in marine environments. This specific specimen appears to have undergone secondary weathering or brecciation, possibly during tectonic movement or through chemical dissolution (karst processes) followed by cementation.

Uses & applications

Primary source of lime for cement, used extensively in construction as aggregate, architectural stone, and as a soil conditioner in agriculture. Pure forms are used in the manufacturing of paper, glass, and plastic.

Geological facts

Limestone occupies about 10% of the total volume of all sedimentary rocks. It is the primary host rock for most of the world's cave systems due to its solubility in slightly acidic water.

Field identification & locations

Identification in the field is best achieved using a 10% hydrochloric acid 'fizz test' (limestone will effervesce). Look for visible fossils or a gritty, crystalline texture. It is ubiquitous globally particularly in ancient seabed regions.