Rock type: Foliated,
regionalmetamorphic.
Texture: Medium-grained.
Structure: Alternating stripes
of dark metamorphic and pale
(leucocratic) igneous rock
""colour: Varied.
Composition: Typically
gneiss with granite. Can also
be schist or amphibollte.
Protolith: May be all gneiss
(or schist or amphibolite) or
may be gneiss and granite.
Temperature: Very high.
Pressure: High.