sedimentary
Limestone with Lichen
Carbonate Sedimentary Rock (primarily CaCO3)
Hardness: 3-4 (Mohs), Color: Light gray to tan with green biological staining, Luster: Dull/Earthy, Structure: Fine-grained clastic, Cleavage: None
- Luster
- Dull/Earthy, Structure: Fine-grained clastic, Cleavage: None
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Physical properties
Hardness: 3-4 (Mohs), Color: Light gray to tan with green biological staining, Luster: Dull/Earthy, Structure: Fine-grained clastic, Cleavage: None
Formation & geological history
Formed in shallow, warm marine waters from the accumulation of calcium carbonate and organic debris. This specimen likely has surface lichen or moss growth due to environmental exposure.
Uses & applications
Commonly used as construction aggregate, road base, and a primary ingredient in cement and lime production.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. This specific piece shows biological colonization, common in rocks exposed to moisture.
Field identification & locations
Identify in the field by its light color and reaction to dilute hydrochloric acid (it will fizz). Commonly found in ancient sea beds and karst landscapes.
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