23 Mineral Groups – Physical Geology opentextbcca23 Mineral Groups Most minerals are made up of a cation , olivine (iron or magnesium silicate (Mg,Fe) 2 SiO 4) (Note that in quartz the anion is oxygen, and while it could be argued, therefore, that quartz is an oxide, it is always classed with the , Native minerals are single element minerals, such as gold, copper, sulphur, and ...