Krohnkite itself is a bizarre species, occuring in good crystals of size only at this classic, sadly underappreciated locality. Specimens today are rare, in crystal form, although massive pieces are much more common. This piece is a strange krohnkite specimen with unique green-blue crystals in the center of this clustre, which I thought might be Lindgrenite at first. However, they are just krohnkite with some kin dof unusual composition, as the crystal habit is right and the green hue grades into blue.
This venerable open pit copper mine has produced the finest specimens of krohnkite, a rare, hydrated, sodium, copper, sulfate. The rich, aquamarine color, translucence, good crystal form, all add to the collectability of this species. This is the single largest crystal I have ever seen, of this mineral. It is a large, translucent, complete crystal that is about ten times bigger than the norm. And those already are rare. Chuqui is one of the most significant localities for interesting minerals in the world, and sadly one of the most underappreciated in the hobby at large. Not only is this rare and significant, but it is beautiful enough to grace any shelf
This lamellar cluster of vertical crystals grown agaisnt one another is truly spectacular, for color; but more than that has a significance for this now-defunct locality , which produced a suite of amazing copper species. RARE material in this quality and size!
ex. Philadelphia Academy of Natural Sciences
Absolutely stunning color makes this unusually large matrix krohnkite a beauty to look at, but its also a super rich example of an extremely rare copper species. Chuqui is located 15 km N of Calama, II Region, Chile. It is the world's largest open pit copper mine, according to MinDat. It hit its heyday by th emid-1900s and during that time produced innumerable mineral specimens which sadly went to the crusher. However, a few people there saved some pieces, and it later turned out that the mine produced a host of new species (many mislabelled in these old collections), identified only long after they were taken from the ground. This one was named after B. Kröhnke, who first analyzed the mineral and realized that not all "chalcanthite" from this mine was that common stuff! Krohnkite is, instead, a very rare copepr sulfate. Ex Philadelphia Academy of Natural Science.
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