fossil

Limestone with Gastropod Fossil

Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion

Hardness: 3 (Mohs scale); Color: light grey to tan; Luster: dull/earthy; Crystal structure: Trigonal (microcrystalline); specific gravity: 2.7. Features a visible spiral fossil impression.

Hardness: 3 (Mohs scale)
Color: light grey to tan
Luster: dull/earthy

Identified July 6, 2026More fossil →

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Physical properties

Hardness: 3 (Mohs scale); Color: light grey to tan; Luster: dull/earthy; Crystal structure: Trigonal (microcrystalline); specific gravity: 2.7. Features a visible spiral fossil impression.

Formation & geological history

Formed in shallow, warm marine environments through the accumulation of shell, coral, and algal debris. The fossil likely dates from the Paleozoic or Mesozoic era.

Uses & applications

Primarily used as a teacher's specimen, collector's item, and historically for building materials and lime production.

Geological facts

Gastropods, or sea snails, are one of the most successful lineages of animals and have been around for over 500 million years. This specific specimen has been naturally tumbled by water.

Field identification & locations

Check for 'vinegar fizz' (effervescence) and look for curved/spiral organic patterns. Commonly found in riverbeds or beaches near limestone outcrops.

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