mineral

Fighting Conch (Sea Shell)

Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)

Hardness: 3.0-3.5 (Mohs); Color: Mottled brown, tan, and cream; Luster: Pearly to sub-vitreous when polished; Crystal structure: Orthorhombic (Aragonite) or Hexagonal (Calcite); Cleavage: None (conchoidal fracture).

Hardness: 3
Color: Mottled brown, tan, and cream
Luster: Pearly to sub-vitreous when polished

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Biogenic formation through secretion by marine gastropods. These shells are typically Holocene (recent) but can be found as fossils in limestone formations such as the Pleistocene deposits of Florida.

Uses & applications

Used primarily in home decor, coastal crafts, aquarium decoration, and as a food source (the animal within) in some cultures. Polished shells are popular in beach-themed jewelry.

Geological facts

Unlike 'True Conchs,' the Florida Fighting Conch is named for the jerky, territorial movements it makes using its operculum. They are scavengers that play a vital role in cleaning the seafloor.

Field identification & locations

Identify in the field by its thick, heavy spire, flared outer lip, and dark brown markings. Commonly found on beaches along the Gulf of Mexico and the Atlantic coast from North Carolina to Florida.

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