-
classes by
several systems based on
their color index,
including into
leucocratic and
melanocratic rocks, or into (mineralogically)
felsic and
mafic rocks...
- may
consist of only
quartz and
feldspar or the term may
refer to any
leucocratic (pale-coloured)
minor intrusion of that
grain size. They are ****ociated...
-
lines and
shapes which are
reminiscent of writing.
Graphic granite is a
leucocratic granitic rock
consisting of
alkali feldspar with
exsolved quartz typically...
- Gneiss,
Meeberrie Gneiss,
Manfred Complex, and un****igned
polydeformed leucocratic gneisses and metasediments. The
Dugel Gneiss is
syenogranitic or monzogranitic...
- plagioclase).
Rocks with
greater than 90%
felsic minerals can also be
called leucocratic, from the Gr****
words for
white and dominance.
Felsite is a petrologic...
-
Trondhjemite is a
leucocratic (light-colored)
intrusive igneous rock. It is a
variety of
tonalite in
which the
plagioclase is
mostly in the form of oligoclase...
-
composition is more
often used (dividing the
igneous rocks into felsic/
leucocratic, mafic/melanocratic and ultramafic). The term "silicic",
widely used...
-
Leucocratic variety of
nepheline syenite from
Sweden (särnaite)...
-
Amitsoq gneiss,
which is
intruded by and
complexly folded into the
younger leucocratic Nuuk gneiss. This
western gneiss complex is
approximately 3600 million...
-
alkalic pyroxene with
accessory titanite,
melanite and nepheline. It is a
leucocratic variety of
analcimite (a foidite).
Blairmorite has also been described...
