But their chemical composition and physical properties are very different. على سبيل المثال, 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 (3.18ز) /cm3), التورمالين (3.05ز / سم 3) and emerald (3.33ز / سم 3) have higher densities. In the indoor test with tribromomethane, only emeralds floated up, و […]
