Cordierite
Cordierite is a silicate mineral prized by collectors for its exceptional color range, with notable Chinese occurrences.
About Cordierite
Cordierite belongs to the silicate class in the cordierite group / indialite group and has the chemical formula (Mg,Fe)2Al3(AlSi5)O18. It crystallizes in the hexagonal system and is one of the most visually varied minerals in the collector market.
Identification & care
Crystals commonly develop as short prismatic crystals (pseudo-hexagonal appearance); also massive, granular. Its color range is broad, including blue, violet-blue, pale blue, gray, pale yellow, and pale brown. The luster is vitreous, the streak is white, and specimens range from transparent to translucent. The cleavage is distinct {100} and {001}. The fracture is subconchoidal to uneven, which aids identification.
Collector context
Collector notes
For collectors, Cordierite is a benchmark crystalline species. Documented Chinese occurrences are recorded at Yaogangxian W-Sn ore field and Shizhuyuan Mine, among others.