Abstract

A recent note by Hubbard (1967) has again stressed the connection between the composition of plagioclase in myrmekite and the amount of associated quartz. Despite the fact that this proportionality relationship was recorded by Becke (1908) very little quantitative data can be found in the literature, due, no doubt, to the scarcity of relatively coarse intergrowths and the technical difficulties inhibiting accurate measurement. By contrast the absence of quartz in pure albite of the rim and intergranular types is well substantiated.

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