Schorl
Schorl is a silicate mineral recognized for its hardness and durability, with known Chinese sources.
About Schorl
Schorl is a silicate mineral in the tourmaline supergroup / schorl-dravite series and has the chemical formula NaFe2+3Al6(BO3)3Si6O18(OH)4. It crystallizes in the trigonal system and ranks among the harder species, with lasting durability.
Identification & care
Crystals commonly develop as prismatic striated crystals; parallel/radiating groups; vertically striated prism faces; hemimorphic; also massive. Its color is typically black to very dark blue-black and opaque. The luster is vitreous, resinous, the streak is gray to very dark gray, and specimens are typically opaque. The cleavage is very poor. The fracture is subconchoidal to uneven, which aids identification.
Collector context
Collector notes
Among collectors of crystallized species, Schorl is a recognized reference. Schorl is widely represented across Chinese provinces, including Hunan, Yunnan, Sichuan, Inner Mongolia.