Characteristics of Monoclinic Crystals 3 crystallographic axes of unequal lengths a single 2-fold symmetry axis Prism Sphenoid Common Minerals of the Monoclinic System Orthoclase Azurite Borax Calaverite Chlorite Colemanite Datolite Augite Epidote Gypsum Kaolinite Malachite Monazite Micas Orpiment Realgar Sphene Spodumene Talc Hornblende Wolframite

Crystal Systems/All About Crystals