Igneous mineral assemblages and microstructures characterising the lamprophyres of Valscura and Val du Haut Boréon: a: euhedral to subhedral crystals of brown AmpI1 and PlI1 partially including ApI1 and MgtI1 in appinite, Val du Haut Boréon. AmpI1 displays oscillatory compositional zoning; b: aggregates of sub-millimetre sized igneous clinopyroxene in spessartite, Val du Haut Boréon; c: vesicles filled by PlI1 and AmpI1 in melanocratic spessartite, Val du Haut Boréon. Phenocrysts of AmpI1 are tangentially oriented around the vescicle; d: chilled margin marking the intrusive contact between a spessartite dyke and the host migmatite in Val du Haut Boréon. Micro-phenocrysts of AmpI1 are within the chilled margin domain; aggregates of EpM1 (see next paragraph) developed in both the rock types close to the intrusive contact; e: zoned crystal of brown AmpI1 rimmed by dark-green AmpI2 in appinite, Valscura; f: leucocratic vein where a phenocryst of AmpI1 is firstly overgrown by dark-green AmpI2 and then by colourless ActM1 (see next paragraph), Val du Haut Boréon. All pictures are taken by plane polarised light.