- A
pegmatite is an
igneous rock
showing a very co**** texture, with
large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes...
-
possesses a
hexagonal crystal system.
Aquamarine mainly forms in
granite pegmatites and
hydrothermal veins, and it is a very
lengthy process that can take...
- the
eastern edge by the Blue
Ridge Front. The
pegmatites intruded into the Ashe Formation. The
pegmatites and
country rock are part of the
Spruce Pine...
-
commonly found in phosphate-rich
pegmatites. It
occurs in the form of
perfect crystals grouped in druses, in
pegmatites, and is
often of precious-stone...
- In
southern Greenland, the
Illimaussaq alkaline complex consists of
pegmatites such as nepheline,
syenites (especially
kakortokite or naujaite) and sodalite...
- granites,
pegmatites, and schists, and "books" (large
individual crystals) of mica
several feet
across have been
found in some
pegmatites.
Micas are...
- The Tin
Mountain pegmatite is an
igneous intrusion located in the
southern Black Hills,
South Dakota. It is a part of the
Harney Peak
Granite dome that...
-
Lepidolite is
found with
other lithium-bearing minerals, such as spodumene, in
pegmatite bodies. It has also been
found in high-temperature
quartz veins, greisens...
-
noted in
beryl dissolution cavities at the
Noumas II
Pegmatite, part of the
Orange River pegmatite belt in the
Northern Cape of
South Africa.
Large crystals...
- aluminium, phosphate,
fluoride and hydroxide. The
mineral occurs in
pegmatite deposits and is
easily mistaken for
albite and
other feldspars. Its density...
