Pegmatite
A species of Igneous Scientific name : Pegmatite RockType : Igneous
Pegmatite, A species of Igneous
Scientific name: Pegmatite
RockType: Igneous
Photo By James St. John , used under CC-BY-2.0 /Cropped and compressed from original 
Description
This igneous rock is characterized by its large and often interlocking crystals. Specimens may contain rare minerals as well as gemstones, including tourmaline, aquamarine, rubies, and sapphires. Pegmatite is also a primary source of lithium, an important component of electronics and batteries. Pegmatites that boast large, showy crystals are sought-after by rockhounds and gem collectors.
Physical Properties
Colors
Pink, grey-white
Texture
Pegmatitic
Chemical Properties
Silica (SiO2) Content
77%
People often ask
General Info
How to Select
Pegmatite, a type of intrusive igneous rock known for its large-grained texture and mineral richness, is desirable based on several factors:
1.Mineral Composition: pegmatite may contain rare minerals not found in other types of rocks. Those with significant amounts of gem-quality minerals are generally more valuable.
2.Crystal Size and Quality: pegmatite can form very large, well-developed crystals. The bigger and higher quality these crystals are, the more prized the pegmatite.
3.Color and Texture: The color and texture of the pegmatite depend on its mineral composition. Varieties with vibrant colors or unique textures (sunch as graphic granite) can be especially appealing.
Remember, the most desirable qualities or varieties of pegmatite largely depend on its intended use and the preferences of the individual user or buyer.
Usage
Pegmatite contains very large crystals that may often be mined from the rock for various uses. For example, beryl and topaz are common components of this rock that may be used as gemstones, whereas minerals such as flourite may be used as a source of flouride. The crystal composition of the specific pegmatite can have a huge impact on its use.
Composition
Most pegmatite are composed of quartz, feldspar and mica, having a similar silicic composition as granite. Rarer intermediate composition and mafic pegmatites containing amphibole, Ca-plagioclase feldspar, pyroxene, feldspathoids and other unusual minerals are known, found in recrystallised zones and apophyses associated with large layered intrusions.
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