- Noun: gneiss nIs
- A laminated metamorphic rock similar to granite
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Derived forms: gneisses
Type of: metamorphic rock
A coarse-grained metamorphic rock having discontinuous foliation; usually dark; composed mainly of quartz, feldspar, mica, and ferromagnesian minerals. Generally classed as trade granite in the building stone industry.
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- they are regarded as being enveloped in regenerated gneisses.
- rocks to the north and south of the gneiss zone are lithologically and structurally distinct from it.
- the nickel mineralization is contained in a layered basic mass if surrounded and underlain by an archean gneiss complex.
- the banded gneisses underlying the mine field are, as a rule, micaceous, the amount of biotite determining mainly the shades of the bands.
- gneiss is called bastard granite