sedimentary
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
AI-generated identification · may be incorrectHardness: 3-3.5 (Calcite/Aragonite); Color: Off-white to tan; Luster: Pearly to dull; Structure: Calcified biological shell; Cleavage: None; Specific Gravity: ~2.7
- Hardness
- 3-3
- Color
- Off-white to tan
- Luster
- Pearly to dull
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Physical properties
Hardness: 3-3.5 (Calcite/Aragonite); Color: Off-white to tan; Luster: Pearly to dull; Structure: Calcified biological shell; Cleavage: None; Specific Gravity: ~2.7
Formation & geological history
Formed through the process of permineralization or replacement where biological calcium carbonate is preserved in marine sediments. Can range from the Paleozoic era to the Holocene.
Uses & applications
Used for geological study, biological education, decorative items, and as a component of fossiliferous limestone used in construction.
Geological facts
Bivalves are one of the most successful groups of mollusks. Their fossils are excellent paleoenvironmental indicators, telling scientists about ancient water depths and temperatures.
Field identification & locations
Identify by the symmetrical valves (shells), growth lines, and hinge structure. Commonly found in sedimentary rock outcrops (limestone/shale) and on beaches.
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