sedimentary

Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)

Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)

AI-generated identification · may be incorrect

Hardness: 5 (variable based on mineral replacement); Color: brownish-tan to gray; Luster: dull to earthy; Crystal structure: none (amorphous to microcrystalline substitution); Cleavage: none.

Hardness: 5 (variable based on mineral replacement)
Color: brownish-tan to gray
Luster: dull to earthy

Identified April 6, 2026More sedimentary →

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At a glance

Common name: Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Scientific name: Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
Category: sedimentary
Identified: April 6, 2026
Method: Standard

AI Estimated Value

$100-$500 for small high-quality tooth fragments; $20,000-$100,000+ for authentic partial skull elements; millions for complete museum-grade specimens.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Hardness: 5 (variable based on mineral replacement); Color: brownish-tan to gray; Luster: dull to earthy; Crystal structure: none (amorphous to microcrystalline substitution); Cleavage: none.

Formation & geological history

Formed via permineralization where minerals (usually silica or calcite) seep into bone pores. This specimen represents the Late Cretaceous period (~66-68 million years ago), typically found in fluvial (river) sedimentary environments.

Uses & applications

Educational display, scientific research (paleontology), and high-end private collection.

Geological facts

T. rex had one of the strongest bite forces of any terrestrial animal. The holes in the skull (fenestrae) served to reduce weight and provide space for massive jaw muscles.

Field identification & locations

Identify by searching for 'honeycomb' internal bone structure or the presence of dentary teeth in sedimentary layers like the Hell Creek Formation. Real fossils often feel cold to the touch and 'stick' to the tongue due to porosity.