mineral
Sea Snail Shell (Top Shell)
Trochidae family (Calcium Carbonate, CaCO3)
Hardness: 3-3.5 on Mohs scale. Color: Cream with reddish-brown spots. Luster: Pearly to dull. Structure: Conical, spiral shape. Composition: Primarily aragonite and calcite.
- Hardness
- 3-3
- Color
- Cream with reddish-brown spots
- Luster
- Pearly to dull
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Physical properties
Hardness: 3-3.5 on Mohs scale. Color: Cream with reddish-brown spots. Luster: Pearly to dull. Structure: Conical, spiral shape. Composition: Primarily aragonite and calcite.
Formation & geological history
Biological secretion by marine gastropods. These shells are composed of biogenic minerals. They are found in marine environments from the intertidal zone to the deep sea.
Uses & applications
Used in jewelry making, button manufacturing (mother-of-pearl), home decor, and biological research. They are common items for shell collectors.
Geological facts
The inner layer of many top shells is lined with nacre, or mother-of-pearl. These snails use their muscular foot to graze on algae along rocky shores.
Field identification & locations
Identify by its conical, 'top' shape and spiral whorls. Common on rocky coasts worldwide. Collectors look for unbroken specimens with clear patterns.
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