The most widespread types of rock are leucocratic gneisses rich in quartz.
2.
This is a small fine-grained, leucocratic intrusive body that cuts the Padarn Tuff at the western end of the Bangor-Caernarfon Ridge.
3.
The Sarn Granite is leucocratic and covers an expanse of about 6 km 2 in contrast to the gabbro and diorite that exist as small and scattered exposures.
4.
Within the low-strain zones, the Dugel Gneiss exists as a medium-grained leucocratic metagranite with phenocrysts of K-feldspar which has recrystallized into granulite facies.
5.
"' Graphic granite "'is a leucocratic granitic rock consisting of alkali feldspar with exsolved quartz typically forming a distinctive repetitive pattern sometimes resembling cuneiform writing.
6.
The Sarn Granite is leucocratic and covers an expanse of c . 6 km ^ 2 in contrast to the gabbro and diorite that exist as small and scattered exposures.
7.
The Narryer Gneiss Terrane is divided into four major rock sequences ( Myers 1990 ); the Dugel Gneiss, Meeberrie Gneiss, Manfred Complex, and unassigned polydeformed leucocratic gneisses and metasediments.
8.
These rock types include iron-rich diorite, gabbro, and norite; leucocratic mafic rocks such as leucotroctolite and leuconorite; and iron-rich felsic rocks, including monzonite and rapakivi granite.
9.
The South Pass pluton is a pegmatitic granite west of South Pass City, and the Sweetwater granite is a fine-to medium-grained leucocratic granite that occurs to the west of the South Pass pluton along the Sweetwater River and Lander Creek.
10.
Approaching the S-C mylonitic, sinistral Estivaux Fault the little deformed melanocratic facies yields to the strongly deformed leucocratic facies, at the same time the contents in microaplite ( representing a residual melt ) descend from 20 % to merely 5 %.
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