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