sedimentary
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
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
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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.
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