Pyrite, Carrollite, Wittichenite, Djurleite
Brüderbund Mine, Kohlenbach Valley, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
Strongly fractured crystals of pyrite (light-yellow), overgrown by carrollite (light crème-grey) with shrinkage cracks, that are cemented by djurleite (blue), and wittichenite (medium-grey). Reflected plane polarized light digital image in air, width 0.5 mm.
Ore microscopy illuminates the opaque “grey ugly” with true reflectance ...
© Günter Grundmann, Detmold