(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

  • $\begingroup$ 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


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.