But their chemical composition and physical properties are very different. De exemplu, emerald has a hardness of 7.5-8, while fluorite has a hardness of 4; emeralds have a density of about 2.7g/cm3, while fluorite (3.18g) /cm3), Tourmalină (3.05G / CM3) and emerald (3.33G / CM3) have higher densities. In the indoor test with tribromomethane, only emeralds floated up, şi […]
