sedimentary
Fossiliferous Limestone with Quartz Veining
Limestone (Calcium Carbonate, CaCO3)
Hardness: 3 (Mohs Scale); Color: Gray to tan with white quartz; Luster: Dull to earthy; Structure: Clastic with small fossil inclusions; Cleavage: None
- Hardness
- 3 (Mohs Scale)
- Color
- Gray to tan with white quartz
- Luster
- Dull to earthy
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Physical properties
Hardness: 3 (Mohs Scale); Color: Gray to tan with white quartz; Luster: Dull to earthy; Structure: Clastic with small fossil inclusions; Cleavage: None
Formation & geological history
Formed in shallow marine environments from the accumulation of shell, coral, algal, and fecal debris. Secondary quartz mineralization occurred later through hydrothermal fluids filling fractures.
Uses & applications
Primarily used in construction, cement manufacturing, and as a soil conditioner. Collector value lies in the fossil content and crystal vugs.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It often contains clues about past marine life and environments.
Field identification & locations
Identified by its reaction to cold dilute hydrochloric acid (it will fizz) and the presence of visible shell fragments or small crystalline cavities.
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