sedimentary

Limestone (Porous/Travertine variant)

Sedimentary Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3-4 (Mohs scale), Color: Cream/Light tan/Off-white, Luster: Dull/Earthy, Structure: Heavily pitted or porous (vuggy), Cleavage: None visible in this form, Specific Gravity: 2.3-2.7

Identified May 16, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs scale), Color: Cream/Light tan/Off-white, Luster: Dull/Earthy, Structure: Heavily pitted or porous (vuggy), Cleavage: None visible in this form, Specific Gravity: 2.3-2.7

Formation & geological history

Formed through the accumulation of shell, coral, algal, and fecal debris in marine environments, or via chemical precipitation in freshwater/spring settings (travertine). The holes are often caused by the dissolution of organic matter or gas bubbles during formation.

Uses & applications

Primarily used in construction (decorative stone, aggregate), cement production, as a soil conditioner in agriculture, and as a popular choice for rock gardens and aquascaping due to its natural, weathered appearance.

Geological facts

Limestone covers about 10% of the Earth's total land surface. Ancient limestone formations are the primary source of 'Karst' topography, which includes spectacular caves and sinkholes.

Field identification & locations

Identify in the field by its porous texture and reactivity to diluted hydrochloric acid (it will fizz). Commonly found in areas that were once prehistoric seafloors. For collectors, look for versions that may contain fossil imprints.