Both calcite and quartz can be found as clear crystals what tests can be used to correctly identify them? You can use the hardness of the mineral to differentiate quartz from calcite. Edit
Jurassic period. The Jurassic began after the mass extinction event that ended the Triassic. Life, however, was quick to recover from this blow and the Jurassic eventually became host to the most diverse range of organisms that Earth had yet seen.Amongst them were the first birds and some of the dinosaurs.urassic period. The Jurassic began after the mass extinction event that ended the Triassic. Life, however, was quick to recover from this blow and the Jurassic eventually became host to the most diverse range of organisms that Earth had yet seen. Amongst them were the first birds and some of the dinosaurs.
Jurassic Period (200 â 145 million years ago) At the end of the Triassic Period there was a mass extinction, the causes of which are still hotly debated. Many large land animals were wiped out but the dinosaurs survived, giving them the opportunity to evolve into a wide variety of forms and increase in number.