Tincalconite
Tincalconite is a borate mineral recognized among collectors for its crystal form and distribution, with known Chinese sources.
About Tincalconite
Tincalconite is a borate mineral in the tincalconite group and has the chemical formula Na2B4O5(OH)4·3H2O. It crystallizes in the trigonal system and is relatively soft, requiring careful handling.
Identification & care
Specimens usually show powdery crusts; pseudomorphs after borax. Its color is typically white to colorless. The luster is vitreous to waxy, the streak is white, and specimens range from translucent to transparent. The cleavage is perfect on {0001}. The fracture is earthy, which aids identification.
Collector context
Collector notes
For collectors, Tincalconite is a benchmark crystalline species. Tincalconite has known Chinese occurrences in Tibet, Qinghai.