Transmitted light photographs of melt inclusions trapped in quartz phenocrysts from the Sciuvechi lava at Pantelleria, Italy. Reprinted from Lowenstern (1994: American Mineralogist 79:353-369). (A) Inclusion P32-39 (60µm in maximum diameter) was experimentally heated to ~825°C and then cooled to 700°C, at which time three small vapor bubbles nucleated. All bubbles nucleated either on the quartz wall or a refractory quartz bleb (q). None nucleated on a small droplet of hydrosaline melt (h), which is ~60-70wt.% molten NaCl, and was trapped along with the melt during crystallization of the quartz. (B) Two hydrosaline melt droplets (4 µm diameter each) were present within P32-49.1 (105 µm in maximum diamter). During heating at 875°C, some opaque crystals (o) remained unmelted but were dissolved above 900°C. (C) During cooling, below 490± 15°C, the hydrosaline melts crystallized and could not be clearly viewed except at 1250X magnification (D and E, for left and right hydrosaline melts, respectively), which showed them to consist of host glass (m), a vapor (+ liquid?) bubble, and a white crystal with cubic habit (presumably halite). The host crystal was flipped and rotated before photographing D and E.