fossil
Brachiopod Fossil
Phylum Brachiopoda
Hardness: 3-4 (calcite composition), Color: grey, beige, or brown, Luster: dull to vitreous, Crystal structure: trigonal (calcite replacement)
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Physical properties
Hardness: 3-4 (calcite composition), Color: grey, beige, or brown, Luster: dull to vitreous, Crystal structure: trigonal (calcite replacement)
Formation & geological history
Formed through permineralization or replacement where the original shell material is replaced by minerals like calcite or silica in marine sedimentary environments, typically Paleozoic to Mesozoic era.
Uses & applications
Used for educational purposes, scientific study of ancient marine ecosystems, and fossil collecting.
Geological facts
Brachiopods superficially resemble clams (bivalves), but they belong to a completely different phylum with a symmetrical top and bottom shell rather than left and right.
Field identification & locations
Found in marine sedimentary rocks such as limestone and shale. Look for distinctly ribbed, symmetrical shells embedded in rock matrix.
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