Andalusite
Andalusite is a silicate mineral prized by collectors for its exceptional color range, with known Chinese sources.
About Andalusite
Andalusite belongs to the silicate class in the sillimanite group (al2sio5 polymorphs) and has the chemical formula Al2(SiO4)O. It crystallizes in the orthorhombic system and is one of the most visually varied minerals in the collector market.
Identification & care
Crystals commonly develop as prismatic crystals with square cross-section; chiastolite shows cross-shaped carbon inclusion pattern; also massive, granular. Its color range is broad, including flesh-pink, pinkish-gray, brownish-red, olive-green (viridine), white, and chiastolite variety: pale with carbonaceous cross. The luster is vitreous, the streak is white, and specimens range from transparent (gem) to opaque. The cleavage is good {110}. The fracture is uneven to subconchoidal, which aids identification.
Collector context
Collector notes
Among collectors of crystallized species, Andalusite is a recognized reference. Andalusite is widely represented across Chinese provinces, including Fujian, Gansu, Anhui, Guangdong.