(I am not a native english speaker, so I'm not really aware of the specific terminology.) A few years back, I found an unidentified rock on a beach in Normandie (France). It looks and feels (texture-wise) kind of like a metal, but it displays big cristals. It has orange tones very reminiscent of iron oxide, and the head of the cristals is dark grey. Here are a few pictures : enter image description here enter image description here enter image description here The measured volumic mass of the piece is 3.4 g/cm^3. Could you help me figure out what this mineral is ? Thank you in advance


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  • $\begingroup$ Is it magnetic? $\endgroup$ – Gimelist Aug 2 '18 at 5:56

Your mineral specimen is most likely goethite after pyrite, a common pseudomorph found in many different geological environments.

A quick google search revealed pyrite and goethite can be found in Normandy.

Mindat - Goethite (map before from Mindat)

Geothite locations in the Normandy region.

Soumont-Saint-Quentin mine, Calvados, Normandy, France

enter image description here


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