fossil
Fossil Shell
Brachiopod or Mollusk fossil
Hardness: 3-4 (calcite/aragonite), Color: White to off-white, Luster: Vitreous to dull, Crystal structure: Trigonal (calcite) or Orthorhombic (aragonite)
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Physical properties
Hardness: 3-4 (calcite/aragonite), Color: White to off-white, Luster: Vitreous to dull, Crystal structure: Trigonal (calcite) or Orthorhombic (aragonite)
Formation & geological history
Formed through the process of permineralization or replacement where organic shell material is replaced by minerals like calcite or silica over millions of years.
Uses & applications
Used for educational purposes, fossil collecting, and decorative display items.
Geological facts
Shell fossils provide vital clues about ancient marine environments, climate changes, and prehistoric ecosystems dating back hundreds of millions of years.
Field identification & locations
Found in sedimentary rock layers worldwide, particularly in limestone and shales deposited in ancient shallow seas. Collectors look for well-preserved ribs and symmetry.
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