Migmatite
A variety of Metamorphic
What is Migmatite?
A migmatite is a hybrid rock of sorts; it contains both igneous and metamorphic components, often in alternating layers. These layers tend to create striking, dark-and-light banding or waving patterns. Though they may be geologically fascinating and pretty to look at, migmatites have few commercial or industrial uses.
Uses & Applications
Migmatite is rarely used outside of the construction industry, and is a commonly used stone for creating foundations, flooring, and walls. When polished, it is an attractive choice for countertops and work surfaces. When crushed, it can be used in the creation of cement and road aggregate.
Migmatite Market Value Calculator
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Migmatite Localities Map
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Key Characteristics
Formation of Migmatite
Migmatite form under extreme temperature and pressure conditions during prograde metamorphism, when partial melting occurs in metamorphic paleosome. Components exsolved by partial melting are called neosome (meaning ‘new body’), which may or may not be heterogeneous at the microscopic to macroscopic scale.
Composition of Migmatite
It consists of two or more constituents often layered repetitively; one layer was formerly paleosome, a metamorphic rock that was reconstituted subsequently by partial melting; the alternate layer has a pegmatitic, aplitic, granitic or generally plutonic appearance.
Quick Facts
Physical Properties
- Color
- Black, bluish-grey, brown, brown-black, dark greenish-grey, dark grey to black, etc.
- Hardness (Mohs)
- 5.5 - 6.5
- Density
- 2.5 - 3 g/cm³
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