XX Mine, Near Llalagua, Oruro Dept., Bolivia
3.8x 3.4 cm
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.
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.