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.
1: L: Geological time, plotted against the 12-month human calendar, so that Earth begins existence on New Years' Day and now is New Years' Eve, just before midnight. R: Details of the Jurassic Period and the Stages into which it is divided by geologists.