sedimentary
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
Hardness: 3 (calcite-based); Color: Off-white, beige, or grey; Luster: Dull/Earthy; Structure: Spiral/High-spired conical shape; Cleavage: None (conchoidal fracture on matrix).
- Hardness
- 3 (calcite-based)
- Color
- Off-white, beige, or grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3 (calcite-based); Color: Off-white, beige, or grey; Luster: Dull/Earthy; Structure: Spiral/High-spired conical shape; Cleavage: None (conchoidal fracture on matrix).
Formation & geological history
Formed through the process of permineralization or as an internal cast (steinkern) where sediment fills the shell of a marine snail; typically found in Eocene or Cretaceous sedimentary deposits (approx. 50-100 million years old).
Uses & applications
Primarily for educational purposes, scientific study, and fossil collecting. Some silica-replaced varieties (Turritella Agate) are used in jewelry.
Geological facts
Turritella fossils are so abundant in certain formations that they create entire 'coquina' layers of rock. The name comes from the Latin word 'turris' meaning tower.
Field identification & locations
Identify in the field by the distinct tapered spiral shape resembling a screw. Commonly found in limestone, shale, or sandstone beds that were once ancient sea floors.
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