Mineral: Marcasite with Pyrite
Locality: Cap Blanc-Nez, Pas-de-Calais, Hauts-de-France, France
Dimensions: 5 x 8.5 x 12 cm / main crystal: 4.1 cm

Description: Mass: 231 g MIM number: 1390 Two tufts of spearhead-shaped twins developed on a clayey chalk base, each one associating 5 crystals, which gives them an almost pentagonal contour. A pyrite ball developed next to the base of one of the tufts. Photographer: AINU / Augustin de Valence; Publications: "101 Minéraux et Pierres Précieuses qu'il faut avoir vus dans sa vie", "Le Règne Minéral hors-série XXV/XXVI 2019-2020 - Les minéraux du Nord et du Pas-de-Calais" Ex collection: Gilles Emringer (France)

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