The texture should not be confused with myrmekite or granophyre, in which quartz forms club-shaped, curved or vermiform threads intergrown with plagioclase feldspar and alkali feldspar, respectively.
12.
His extensive studies by thin sections, cathodoluminescence, electron microprobe and scanning-electron images supported an entirely different model in which K-metasomatism of primary plagioclase produced the myrmekite.
13.
The myrmekite does not show wartlike tapering vermicules, but vermicules that are nearly constant in size because the host plagioclase containing the quartz vermicules has nearly a constant Na / Ca composition.
14.
Yet Lorence G . Collins does not agree with the assumption of the K-feldspar being primary magmatic and the myrmekite being formed due to deformation-induced Na-Ca-metasomatism.
15.
This leads via the replacement of primary K-feldspar ( perthitic and non-perthitic microcline ) to the formation of plagioclase ( albite or oligoclase ) and in certain places also to the formation of myrmekite.
16.
Thus, the combination of myrmekite and Po-halos ( neither of which can form from a granite magma ) becomes a strong indicator that not all granite bodies of large size need be formed from magma.
17.
Myrmekite is a microscopic, vermicular ( worm-like ) intergrowth of quartz and sodium-rich plagioclase common in granite; myrmekite may form as alkali feldspar breaks down by exsolution and silicon is transported by fluids in cooling rocks.
18.
Myrmekite is a microscopic, vermicular ( worm-like ) intergrowth of quartz and sodium-rich plagioclase common in granite; myrmekite may form as alkali feldspar breaks down by exsolution and silicon is transported by fluids in cooling rocks.
19.
On his website he so far has authored and co-authored more than 50 scientific articles . ( See external links at end of article . ) His latest article on this website summarizes his research on the origin of myrmekite and metasomatic granite.
20.
There he came upon the mineral intergrowth called myrmekite where its origin did not fit the usually accepted models as to either being formed by exsolution from primary K-feldspar or by Na-and Ca-metasomatism along the margins of primary K-feldspar.
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