sedimentary
Carbonate Beach Sand
Biogenic Carbonate Sediment (CaCO3)
Hardness: 3 (Calcite); Color: white to light tan; Luster: earthy; Structure: granular/fragmental; Specific Gravity: approx 2.7.
- Hardness
- 3 (Calcite)
- Color
- white to light tan
- Luster
- earthy
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Physical properties
Hardness: 3 (Calcite); Color: white to light tan; Luster: earthy; Structure: granular/fragmental; Specific Gravity: approx 2.7.
Formation & geological history
Formed through the erosion of coral reefs, mollusks, and calcareous algae. Common in tropical marine environments, often dating from the Holocene epoch.
Uses & applications
Used in glass manufacturing, concrete production, beach nourishment, and aquarium substrates.
Geological facts
Many tropical white sand beaches are composed primarily of parrotfish excrement, as they eat coral and excrete it as fine sand.
Field identification & locations
Identify by granular texture and reaction to dilute hydrochloric acid (fizzing). Commonly found in the Caribbean, South Pacific, and Maldives.
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