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Gneiss
Name:
Gneiss
Other Name:
schist, porphyritic, amphibolite, quartzite
Pronunciation:
nise
Type:
Metamorphic
Classification:
High-grade Metamorphic rock
Luster:
Dull
Chemical Formulation:
Feldspars, Quartz, Mica, Amphibole
Fluorescent:
No
Mohs Hardness:
6 - 7
Color:
Black, Brown, Pink, Red, White
Fracture/Cleavage:
Irregular
Uses:
Building Stone, Decorative, Aggregate, Landscaping
Key Features:
In traditional English and North American usage, gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity (mineral banding) and indistinct cleavage.
Sources:
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