Pegmatopia

Where might one look for natural evidence for boundary layers? First, they exist only along the growth surfaces of minerals, not in the bulk melt. Hence, these are the liquids that are likely to be entrapped as fluid inclusions when minerals grow. Crystal-rich inclusions, such as those documented from the Tanco pegmatite (London, 1986) are likely representatives of this boundary layer of melt (Fig. 6, 7).

Fig. 7. SEM image of a cystal-rich inclusion in spodumene from the Tanco pegmatite, Manitoba. See details in London (1986).


	Where might one look for natural evidence for boundary layers? First, they exist only along the growth surfaces of minerals, not in the bulk melt. Hence, these are the liquids that are likely to be entrapped as fluid inclusions when minerals grow. Crystal-rich inclusions, such as those documented from the Tanco pegmatite (London, 1986) are likely representatives of this boundary layer of melt (Fig. 6, 7). Fig. 7. SEM image of a cystal-rich inclusion in spodumene from the Tanco pegmatite, Manitoba. See details in London (1986).		Fig. 6. Crystal-rich inclusion in spodumene, shown in partially cross-polarized light, from the Tanco pegmatite, Manitoba. See details in London (1986).