Fig. 7
From: The use of mineral interfaces in sand-sized volcanic rock fragments to infer mechanical durability
No-isostructural glass-rich interface between a phenocryst and a glassy groundmass. a, b: Pl/Glgr interface (Plagioclase/Glassy groundmass). a Crossed nicols; b Plane-polarized light; c, d: Ol/Glgr interface (Olivine/Glassy groundmass); c Crossed nicols; d Plane-polarized light; e, f: Px/Glgr interface (Pyroxene/Glassy groundmass); e Crossed nicols; f Plane-polarized light. Twin domains of plagioclase (a, b), olivine fracture (c, d) and pyroxene cleavage (e, f) are intracrystals interfacial features [10x, Very coarse sand (2.00–1.00 mm); + = polarizing microscope crosshair]