Augite
Augite is a silicate mineral recognized among collectors for its crystal form and distribution, with known Chinese sources.
About Augite
Augite belongs to the silicate class in the pyroxene group (clinopyroxene) and has the chemical formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. It crystallizes in the monoclinic system and holds a steady position among silicate species.
Identification & care
Crystals commonly develop as short prismatic 8-sided (octagonal cross-section) crystals; massive; granular; lamellar. Its color range is broad, including dark green, black, dark brown, and greenish black. The luster is vitreous, sub-metallic, resinous, the streak is greenish gray, and specimens range from opaque to translucent. The cleavage is good on {110} at ~87° (characteristic pyroxene angle). The fracture is uneven, which aids identification.
Collector context
Collector notes
Augite holds a steady place in systematic mineral collections. Augite is widely represented across Chinese provinces, including Fujian, Gansu, Anhui, Guangdong.