sedimentary
Limestone (River Stone)
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3-4 (Mohs); Color: Grey with visible bedding planes; Luster: Dull/Earthy; Structure: Fine-grained clastic/biogenic; Cleavage: None/Irregular
- Hardness
- 3-4 (Mohs)
- Color
- Grey with visible bedding planes
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3-4 (Mohs); Color: Grey with visible bedding planes; Luster: Dull/Earthy; Structure: Fine-grained clastic/biogenic; Cleavage: None/Irregular
Formation & geological history
Formed in shallow marine environments from the accumulation of shell, coral, algal, and fecal debris. This specimen has been rounded by fluvial (water) erosion.
Uses & applications
Construction material, crushed stone for road base, cement manufacturing, soil conditioner, and decorative landscaping.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It often contains fossils of ancient marine organisms.
Field identification & locations
Identify by its grey color and faint layering (bedding). It will react and fizz (effervesce) if exposed to a drop of weak acid such as vinegar.
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