Pegmatitic Peridotite

Pegmatitic Peridotite Pegmatite. a pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. These rocks are rare on the surface, but make up peridotite, the rock of the upper mantle. it is poor in silica, in the 40% or less range. on the figure above, the top row has both plutonic and volcanic igneous rocks arranged in a continuous spectrum from felsic on the left to intermediate, mafic, and ultramafic toward the right.

Pegmatitic Peridotite Pegmatite is an intrusive igneous rock defined by its very large, interlocking crystals that can range in size from 1 cm to over 1 meter. it is usually primarily composed of quartz, feldspar, and mica, but often includes rarer minerals and gemstones. pegmatite forms in the last stages of magma crystallization. Pegmatitic textures can develop in any intrusive igneous rock type from ultramafic, to granitic, to syenitic in composition. most commonly, the term is used to refer to granitic pegmatites and is generally understood to refer to rock of overall granitic composition when it is used without a qualifying adjective ( e.g. gabbroic pegmatite). Pegmatite is an exceptionally coarse grained plutonic igneous rock. most pegmatites have a mineralogical composition of granite but composition has no defining importance here. pegmatites may have any imaginative magmatic composition and they are actually known to contain a large number of unusual minerals. pegmatite is a very coarse grained. The peridotite "family" contains a number of different intrusive igneous rocks. these include lherzolite, harzburgite, dunite, wehrlite, and kimberlite (see photos). most of them have an obvious green color, attributed to their olivine content. lherzolite: a peridotite composed primarily of olivine with significant amounts of orthopyroxene and.

Pegmatitic Peridotite Pegmatite is an exceptionally coarse grained plutonic igneous rock. most pegmatites have a mineralogical composition of granite but composition has no defining importance here. pegmatites may have any imaginative magmatic composition and they are actually known to contain a large number of unusual minerals. pegmatite is a very coarse grained. The peridotite "family" contains a number of different intrusive igneous rocks. these include lherzolite, harzburgite, dunite, wehrlite, and kimberlite (see photos). most of them have an obvious green color, attributed to their olivine content. lherzolite: a peridotite composed primarily of olivine with significant amounts of orthopyroxene and. Peridotite is a type of ultramafic igneous rock that is primarily composed of the mineral olivine, along with smaller amounts of other minerals such as pyroxenes and amphiboles. it is one of the main rock types found in the earth’s mantle, which is the layer of the earth that lies below the crust. the composition of peridotite typically. Pegmatitic texture refers to crystalline plutonic or intrusive igneous rocks with exceptionally large crystals. rocks of this texture have crystals at least 0.4 inches (1 cm) in diameter, with larger ones more than 1.2 inches (3 cm) to as large as several feet. most pegmatitic textured rocks have feldspar, quartz, mica, and silicic compositions.

Pegmatitic Peridotite Peridotite is a type of ultramafic igneous rock that is primarily composed of the mineral olivine, along with smaller amounts of other minerals such as pyroxenes and amphiboles. it is one of the main rock types found in the earth’s mantle, which is the layer of the earth that lies below the crust. the composition of peridotite typically. Pegmatitic texture refers to crystalline plutonic or intrusive igneous rocks with exceptionally large crystals. rocks of this texture have crystals at least 0.4 inches (1 cm) in diameter, with larger ones more than 1.2 inches (3 cm) to as large as several feet. most pegmatitic textured rocks have feldspar, quartz, mica, and silicic compositions.

Pegmatitic Peridotite