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Can anyone help me identify these minerals please? I found them on a beach in northern England. The first has tiny angular crystals, some slightly pinkish maybe in certain lighting conditions but grey in others. The second I believe may be pyrite?

Thanks in advance. enter image description here

enter image description here

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closed as off-topic by Fred, arkaia, Jan Doggen, Peter Jansson, trond hansen May 24 at 16:26

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  • "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – Fred, arkaia, Jan Doggen, Peter Jansson, trond hansen
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  • $\begingroup$ Is this the same rock? If not, make it two different questions. $\endgroup$ – Jan Doggen May 22 at 8:25
  • $\begingroup$ Two different rocks found at the same location at the same time $\endgroup$ – Jayne May 22 at 10:19
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First image appears to have fossil fragments either coral or crinoid stems. As for the pink crystals, most likely calcite, aragonite, dolomite and quartz in decreasing order of likelihood.

The second image definitely has iron sulfide crystals in the rock. Square cross section suggests pyrite rather than marcasite.

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  • $\begingroup$ Thank you. The tiny crystals in the first image look metallic in some lights but pinkish in others. They are quite angular so maybe calcite? $\endgroup$ – Jayne May 22 at 10:19

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