单词	microgranite
释义	microgranite /ˈmʌɪkrəʊˌɡranɪt / noun [mass noun] Geology Granite that is recognizable as crystalline only under a microscope.This is a coarsegrained biotite gneiss with an average granodioritic composition, that is generally fairly homogeneous but locally shows gneissic banding, and is intruded by veins of microgranite and pegmatite.... The age of the Carrock microgranite provides further evidence that both calc-alkaline and tholeiitic magmas were available during Caradoc magmatism in the Lake District. The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet; zircon and apatite are conspicuous accessory minerals.
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