Twinned marcasite / sperkise - Cap Blanc-Nez, Pas-de-Calais,...
Marcasite with numerous well-expressed spearhead twins...
Marcasite crystals presenting the sperkise twin on chalk matrix from
its very specific locality : Le Cap Blanc Nez, North of France.
6,5 x 5 x 5 cm
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Marcasite with numerous well-expressed spearhead twins...
Marcasite in crystallized nodule presenting numerous spearhead...
Crystallized marcasite on limestone matrix, very shiny with...