Rock Identifier
Fossil Shell (Invertebrate fossil (Mollusca)) — fossil
fossil

Fossil Shell

Invertebrate fossil (Mollusca)

Hardness typically 3-4 (Mohs scale, depending on mineral replacement), white to cream color, vitreous to dull luster, composed of calcium carbonate (aragonite or calcite).

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Physical properties

Hardness typically 3-4 (Mohs scale, depending on mineral replacement), white to cream color, vitreous to dull luster, composed of calcium carbonate (aragonite or calcite).

Formation & geological history

Formed through the process of fossilization where the hard parts of marine organisms are buried in sediment and preserved over millions of years.

Uses & applications

Used for educational purposes, fossil collecting, and decorative items.

Geological facts

Fossil shells provide crucial evidence of ancient marine environments and past climates.

Field identification & locations

Found in sedimentary rock formations worldwide, particularly in limestone and shale deposits.

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Fossilized Crinoid Stem in Limestone (Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix) — fossil

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Fossiliferous Limestone with Crinoid stems

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