All sorts of bargains were to be found among the recent Peruvian finds brought in by Jaroslav Hyrsl, and even a 10-cm crystal group of the world-class (and pretty!) coquimbite
from the Javier mine asked no more than $200.
Also in his stock were colorful (but unfortunately unstable) fine crystals of the iron sulfates voltaite, coquimbite
Such minerals have rarely been studied or collected because they are usually unattractive in hand specimen; moreover, some have a tendency to deliquesce, dehydrate, oxidize, and generally self-destruct (e.g., melanterite, epsomite, coquimbite
Among them were colorful (but unfortunately unstable) iron sulfates such as voltaite, coquimbite
, botryogen and others from the abandoned subterranean workings in the area of the Alfred pit, Riotinto mine, Riotinto, Huelva.