Dinosaur Egg Fossil
Image: Gary Todd (CC0)
Mineral NameDinosaur Egg Fossil
Chemical FormulaPrimarily SiO2 (quartz) or CaCO3 (calcite), replacing original organic material
Mohs Hardness3
Streak ColorWhite to light brown or grey
CleavageAbsent or poor
FractureUneven to conchoidal
Specific Gravity2
Colorsbrown, grey, tan, reddish-brown, black
TransparencyOpaque
Type LocalityXixia, Henan Province, China; Gobi Desert, Mongolia; Patagonia, Argentina
Mineral GroupFossilized organic material / Sedimentary rock
Usesscientific study, museum display, collector's item
Associated Mineralsquartz, calcite, clay minerals, iron oxides, sandstone, shale
Description
A fossilized egg, typically ovoid or spherical, exhibiting the preserved shell structure and sometimes internal features, often embedded in a sedimentary matrix.
Geological Context
Formed when dinosaur eggs are buried rapidly in sediment, allowing organic material to be replaced by minerals (permineralization) over millions of years, commonly found in ancient lakebeds or floodplains.
