sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
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
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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.
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