Rock Identifier
Fossilized Bone Fragment (Vertebrate Fossil Material (Apatite/Calcium Phosphate)) — fossil
fossil

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Hardness: 3.5-5 on Mohs scale; Color: Dark brown, brownish-grey to black; Luster: Dull to earthy; Texture: Honeycomb or porous trabecular structure visible on fresh fractures or weathered surfaces; Specific Gravity: 2.6-3.0

Hardness
3
Color
Dark brown, brownish-grey to black
Luster
Dull to earthy
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Physical properties

Hardness: 3.5-5 on Mohs scale; Color: Dark brown, brownish-grey to black; Luster: Dull to earthy; Texture: Honeycomb or porous trabecular structure visible on fresh fractures or weathered surfaces; Specific Gravity: 2.6-3.0

Formation & geological history

Formed when ancient animal bones were buried rapidly in sediment. Mineral-rich groundwater percolated through the porous bone structure over millions of years, replacing organic collagen and hydroxyapatite with minerals like calcite, silica, or iron oxides. Typically dates from Paleozoic to Pleistocene eras.

Uses & applications

Used primarily as scientific educational specimens, display pieces for fossil collections, and occasionally carved into lapidary art or jewelry.

Geological facts

Fossilized bone can often be distinguished from ordinary rock by touching it to the tongue; the tiny microscopic pores produce a characteristic sticky adherence.

Field identification & locations

Look for distinctive spongy cellular patterns (cancellous bone structure) in cross-section. Commonly found in sedimentary deposits, ancient riverbeds, and badland formations worldwide.

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