A fine and attractive specimen of this rare Lead, Silver, Antimony "black ugly" mineral. Until the 2004 find, Andorites were one of the rarer Sulfosalts and crystals were always quite tiny. This piece is from that discovery and unusually esthetic, excellent for the size, condition and distinct form of these crystals. The metallic luster and steel to brassy hues are as good as these ever get. Ex Kosnar, there are now very few of this caliber to be found. An outstanding example of this rare Silver specie.
HOLD Franckeite (var. Potosiite)
stock #HOLD 7-R-13-193
San Jose Mine, Oruro
7.5 x 4.6 CM (small cabinet/ large miniature)
Potosiite is the rare Tin poor variety of the rare mineral Franckeite, and was a separate species until it was discredited in 1997. It is still a very rare Sulfide with crystals larger than micros considered huge. From a small find of the worlds largest and best crystals at the San Jose mine, this is a top example with individual crystals to 1.3 cm. For this rare and ugly mineral this is a true killer and even esthetic! This was rated as one of the best 7 pieces found.