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These results indicate that the biotites crystallized at high temperatures (Deer et al.
2]+-Mg biotite diagram shown in Figure 5, all of the biotites that were analyzed in this study fell between the Ni-NiO and [Fe.
Gilkes RJ, Suddhiprakarn A (1979) Biotite alteration in deeply weathered granite.
Biotite is the only significant ferromagnesian mineral in the Monte Capanne pluton, occurring as 2-3 into crystals in the matrix with Mg#-0.
3), and consist principally of fine-grained plagioclase laths and biotite with varying quantities of generally rounded and resorbed xenocrysts of K-feldspar and quartz; textures include doleritic, ophitic, and microgranular (Fig.
1970, Composition of coexisting garnets and biotites from some granulites of Moldanubicum, Czechoslovakia, N.
A very typical common feature of both granites is the abundance of small, restitic nodules of biotite, sometimes accompanied by fibrolitic aggregates of sillimanite.
Biotite in this study refers to a regular 1:1 interstratified (mixed-layer) biotite-vermiculite, a mineral recognized in many vermiculite deposits (Boettcher, 1966).
5b represents the XRD pattern of hydrobiotite (a specific mineral name for mixed-layer structure with regularly alternating biotite and vermiculite components).
The upper drill hole down to some 1310 m has passed through mica schist with rare interlayers of biotite gneiss (Kukkonen, 2009).
But due to the structural identity and close chemistry between biotite and phlogopite we apply the priority term hydrobiotite for Bi-Ve regular interstratification introduced by Veniale and van der Marel (1969).