Grossular is a calcium-aluminium species of the garnet group of minerals. It has the chemical formula of Ca3Al23 but the calcium may, in part, be replaced by ferrous iron and the aluminium by ferric i
Grossular dodecahedron, 7 mm across, from Coahuila, Mexico
Striated crystals of hessonite, a variety of the grossular species
Color range of grossular graphically displayed at the National Museum of Natural History Washington, D.C.
Group of Grossular crystals, largest 1.1 cm, from Val-des-Sources, Quebec
Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Grossular
…Grossular is a calcium-aluminium species of the garnet group of minerals. It has the chemical formula of Ca3Al2(SiO4)3 but the calcium may, in part, be replaced by ferrous iron and the aluminium by ferric…
A sample showing the deep red color garnet can exhibit.
Crystal structure of pyrope garnet: White spheres are oxygen; black is silicon; blue is aluminium; and red is magnesium.
Same view, with ion sizes reduced to better show all ions