Contacto Vein, Siglo XX Mine (Siglo Veinte Mine), Llallagua, Bustillo Province, Potosi Department, Bolivia
A classic single crystal of Vivianite from the famous Siglo XX mine. This superb, very sharp, rather lustrous, gemmy, rich emerald green color “sword”-shaped crystal is one of the better quality single Vivianites that I’ve offered from this famous locality. Subscribers to the Mineralogical Record know that an entire issue was dedicated to this unique and historic locality, and those who are familiar with specimens from this mine know that good quality Vivianites are next to impossible to obtain. This is a historic specimen that was collected in the 1940s when the Siglo XX Mine was booming with new and exciting phosphates!