- with
lesser quartz and biotite.
Under BGS terminology, a
pegmatitic rock (for example, a
pegmatitic gabbro) is a co****-grained rock
containing patches of...
-
extending across the
surface of the stone.
Chrysoberyl forms as a
result of
pegmatitic processes.
Melting in the Earth's
crust produces relatively low-density...
- The Fregeneda–Almendra
pegmatitic field is a
geologic area in the
Iberian Peninsula extending across the
Portuguese district of
Guarda and the Spanish...
-
textures are phaneritic, aphanitic, porphyritic, gl****y, pyroclastic, and
pegmatitic.
Aphanitic (a = not,
phaner = visible) rocks, in
contrast to phaneritic...
- fluoride-bearing pegmatites. To the
north of Igaliku,
there are the
Gardar alkaline pegmatitic intrusions of
augite syenite, gabbro, etc. To the west and
southwest are...
- Rock
texture Name of
felsic rock
Pegmatitic Granite pegmatite Co****-grained (phaneritic)
Granite Co****-grained and
porphyritic Porphyritic granite Fine-grained...
- 2/m 2/m)
crystals or in m****ive form,
being found in
metamorphic and
pegmatitic rock.
Zoisite may be blue to violet, green, brown, pink, yellow, gray...
- the base of the
banded zone. It
consists of one to
three meter thick pegmatitic peridotite and
troctolite with
disseminated sulfide minerals.
Common sulfides...
- Mountain,
Lovozero M****if, Kola Peninsula, Russia. On
Alluaiv it
occurs in
pegmatitic veins in
nepheline syenite. It
occurs with
sodalite in
syenite xenoliths...
- and the
vanadium dravite. A lithium-tourmaline
elbaite was one of
three pegmatitic minerals from Utö, Sweden, in
which the new
alkali element lithium (Li)...
