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VI.—Geology and Petrology of the Intrusions of the Kilsyth-Croy District, Dumbartonshire
Published online by Cambridge University Press: 01 May 2009
Extract
The general appearance of this rock in thin section is of an interlocking framework of plagioclase, augite, and iron-ores, with micropegmatite occupying the interstices. The mutual relations of the felspar and augite vary considerably. The felspar may be entirely enclosed in the augite. In this case it is very basic and only faintly zoned. The most common relation is for the augite to enclose the terminations of the felspar laths, the sub-ophitic structure of Watts. But frequently idiomorphic crystals of augite are found partly or wholly enclosed in felspar. The latter is then more acid than the ophitic felspar, and is broadly zoned. These varying relations may frequently be found within the limits of a single slide.
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