Light gray-brown bands of viaeneite in pyrite/marcasite (pinkish white) with sphalerite (dark gray). Image width about 1 mm. The viaeneite bands have a thickness of about 20 µm. From the type locality La Mallieue, Engis, Liège Province, Belgium. Photo courtesy Willy Viaene (1940-2000).
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Photo added: 4th Nov 2009