The second phase of injection time is close to the main phase and is represented by medium- and fine-grained
leucocratic granites with rare potassium feldspar phenocrysts.
The clinopyroxene-bearing albitite is a
leucocratic granoblastic, fine- to medium-grained rock, dominated by albite ([Ab.sub.94-96]) and quartz, with minor amounts of clinopyroxene ([En.sub.30-36] [Fs.sub.12-23]; Na = 0.12-0.15 a.p.f.u.; Mg# = 0.57-0.75); (Figure 4(f)).
A
leucocratic, medium-grained rock suspected to be nephelinite was also encountered around Uganga hill.
The granite is
leucocratic, shows colour variation and at places is a mixture of yellow, brown and black.
These minerals were collected from miarolitic pegmatites, hydrothermal veins and greisens associated with the upper portions and first-crystallized parts of the peraluminous Mount Antero Granite, especially within the
leucocratic variant of the granite.
The granites in this area are
leucocratic in appearance and vary in color and mineralogical composition.
Anil points out that "Webster's 2nd defines pilandite as 'a
leucocratic porphyry with phenocrysts, a groundmass of anorthoclase, and a little amphibole" and adds "Well at least I know what 'a', 'with', 'of', 'and', and 'little' mean." I checked the definition and it concludes with "Cf.
The main rock types in this borehole are biotite gneisses and sillimanite-biotite gneisses to metatexites (stromatitic migmatites) with relatively rare intercalations of diatexites (
leucocratic migmatites).
Also of great interest are newly discovered jadeite deposits in the Polar Urals (Levy Kechpel, etc.), represented by veins in the
leucocratic gabbroid mass.
The Karunjhar Hill granite is gray, partly fresh and
leucocratic, coarse grained.