sedimentary

Limestone with Lichen/Moss

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3-4 on Mohs scale; Color: Grey, white, buff with green organic growths; Luster: Dull/Earthy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Irregular

Hardness: 3-4 on Mohs scale
Color: Grey, white, buff with green organic growths
Luster: Dull/Earthy

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 3-4 on Mohs scale; Color: Grey, white, buff with green organic growths; Luster: Dull/Earthy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Irregular

Formation & geological history

Formed in shallow, warm marine waters from the accumulation of shell, coral, algal, and fecal debris. It is a biochemical sedimentary rock that can range from Cambrian to Holocene in age.

Uses & applications

Primary use in construction as aggregate, cement production, soil treatment in agriculture, and as a dimension stone for architecture.

Geological facts

Limestone makes up about 10% of the total volume of all sedimentary rocks. It is highly reactive to acid and is the primary rock type found in karst landscapes where caves form.

Field identification & locations

Identify in the field using the 'acid test' (it bubbles when exposed to dilute hydrochloric acid or vinegar). It is commonly found in outcrops, quarries, and road cuts in geologically stable regions.