orthorhombic dimorph of pyrite with cockscomb blade clusters, metallic luster and iridescent tarnish; prized for sculptural form yet requires caref…
Regional guide
Marcasite from Cap Blanc-Nez, France
Cap Blanc-Nez, France — a premier locality for marcasite in chalk, prized for sharp bladed crystals and the key distinction from pyrite for collectors.
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