BLP26 Cronstedtite

Siglo XX Mine, Near Llalagua, Oruro Dept., Bolivia

4.5x 3.8x 3.4 cm

$145

A rare specimen of cronstedtite from the Llallagua Mine.  I purchased these from a miner at the locality in 2008.  This is a very rich example of this serpentine group species, something that really does not turn up often.

I have seen them for sale only a couple times, from Bolivia and Romania.  As a side note, this species simultaneously contains two oxidation states of iron.