Biogenic material
Seashell fragment
Calcium carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 (calcite) to 3.5-4 (aragonite) on the Mohs scale. Displays layered growth lines, often in curved, ribbed shapes with white, grey, and tan colors.
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Physical properties
Hardness of 3 (calcite) to 3.5-4 (aragonite) on the Mohs scale. Displays layered growth lines, often in curved, ribbed shapes with white, grey, and tan colors.
Formation & geological history
Formed by marine mollusks secreting calcium carbonate to build their exoskeletons. Found globally on beaches and in marine environments.
Uses & applications
Commonly collected for beachcombing, used in crafts, and crushed for calcium supplements or soil amendments.
Geological facts
Many shells exhibit tiny holes bored by predatory sea snails, a process known as bioerosion, visible on the right side of this specimen.
Field identification & locations
Identifiable by its distinct layered, curved shape and biological origin. Found abundantly along coastlines.
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