fossil

Fossilized Bone

Petrified Bone (Fluorapatite / Calcium Phosphate replacement)

Hardness varies from 5 to 6 on the Mohs scale due to mineral replacement; color is typically tan, brown, reddish-brown, or grey; luster is dull to earthy; retains the porous microscopic cellular structure of original bone.

Identified August 6, 2026More fossil →

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Physical properties

Formation & geological history

Formed through permineralization where groundwater rich in minerals (such as silica or calcium carbonate) seeps into buried bone, replacing organic material with stone over thousands to millions of years.

Uses & applications

Used for scientific research, educational exhibits, paleontology collections, and decorative display pieces.

Geological facts

Fossilized bones do not contain actual bone material anymore; they are entirely stone casts or mineral replacements preserving the original anatomical shape and micro-structure.

Field identification & locations

Found in sedimentary rock layers, riverbeds, and erosion sites worldwide. Identified by its weight (heavier than modern bone), stony texture, and preservation of trabecular bone structure.

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Sedimentary bedrock formation (variable composition)

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Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

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Crinoid Stem Fossils (Indian Beads / St. Cuthbert's Beads)

Crinoid columnal ossicles (phylum Echinodermata)

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Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

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Fossiliferous Limestone

Limestone with embedded fossil cross-section

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