Life and Minerals: the Machów mine (Poland)
The History of Life cannot be told whatsoever without telling the History of the minerals that lead to its origin...
The case of the Milpillas chalcocite-covered pyrite: a case of analysis misinterpretation.
Some time ago, beautiful specimens of pyrite crystals from Milpillas mine (Mexico) covered by a thin layer of chalcocite (Cu2S),...
The hopper gold crystals from Serra do Caldeirao, Mato Grosso (Brazil)
I received a beautiful sample of native gold for its quantitative analysis. The sample is not the typical nugget. Instead,...
A ‘martian’ solution for a mineral problem: chalcocite coating on pyrite
Our friends from Fabre Minerals asked us an interesting mineralogical question: what is the species present in the beautiful specimens of copper sulfide-coated...
The extraordinary finding of uranyl minerals at Assunçao mine (Viseu, Portugal)
The Assunçao or Nossa Senhora da Assunçao mine, in Aldeia Nova, Ferreira de Aves, Sátao (Viseu, Portugal), benefits industrial minerals from...
Bertrandite from Portuguese pegmatites
The beryllium sorosilicate Bertrandite (Be4(Si2O7)(OH)2) is one of the most important beryllium minerals that could be found in granitic pegmatites....
The chromate-rich mimetite from Nakhlak (Iran)
Description of the chromium-rich mimetite from Nakhlak mine (Iran)
The Olshanskyite and other minerals from Shijiangshan (Ulanhad League, Inner Mongolia, China).
The description of the Olshanksyite from Shijiangshan (China)
Volborthite and tangeite from Milpillas mine (Mexico)
The Milpillas mine (Municipio de Santa Cruz, Sonora, Mexico) benefits a porphyry copper deposit, characterized by a potent oxidation zone and...
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Featured image
Sulfur from Giumentaro mine (Sicily). From espiadellabo.com (in Spanish). 