sedimentary

Vuggy Limestone

Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3-4 (Mohs); Color: tan, grey, cream; Luster: dull to earthy; Texture: pitted/porous with irregular cavities (vugs); Specific Gravity: 2.3-2.7

Hardness: 3-4 (Mohs)
Color: tan, grey, cream
Luster: dull to earthy

Identified July 20, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs); Color: tan, grey, cream; Luster: dull to earthy; Texture: pitted/porous with irregular cavities (vugs); Specific Gravity: 2.3-2.7

Formation & geological history

Formed in marine environments from the accumulation of calcium carbonate shells and coral. The holes (vugs) are created through dissolution by acidic groundwater or the decaying of organic material encased in the rock.

Uses & applications

Commonly used in construction aggregate, road base, and as decorative garden stones. High-purity limestone is used in cement manufacturing.

Geological facts

This specimen displays a natural phenomenon called pareidolia, where the mind perceives a recognizable image (like a face or skull) in random patterns. The holes are likely ancient shell molds or dissolution features.

Field identification & locations

Identified by its reaction to dilute hydrochloric acid (it will fizz). Look for rounded edges indicating water erosion, and characteristic pitting or small fossil fragments. Commonly found in riverbeds and coastal regions.