The following is a list of rock types recognized by petrologists. There is no agreed number of ... Dunite - a phaneritic ultramafic rock composed of more than 90% olivine · Essexite - a silica-undersaturated .... grained metamorphic rock with light and dark alternating bands: Granulite - a high grade metamorphic rock formed ...
Gneiss is a common distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. It is often foliated (composed of layers of sheet-like planar structures). ... The lighter bands contain relatively more felsic (silicate minerals, containing ...
A. loosely coherent rock composed of broken fragments that formed along a fault zone ... E. composed of alternating bands of light and dark silicate minerals.
Alternating bands are known to Geologists as Gneissose Banding, and is used to instantly ... What rock has parallel bands of dark and light mineral grains?
Mar 24, 2014 ... Which is the coarse-grained rock which is composed mainly of ... _____ is composed of alternating bands of light and dark silicate minerals.
When certain mineral crystals recrystallize w/orientation..the rock is said to exhibit ... below is composed of alternating bands of light and dark silicate minerals.
b. loosely coherent and composed of broken fragments that formed along a fault zone ... f. composed of alternating bands of light and dark silicate minerals ...
The rocks and minerals described in this booklet can be found in Maine. ... Basalt is a dark, fine grained volcanic rock that is formed when magma is ... This banded metamorphic rock is composed of alternating bands of light ... A black iron aluminum silicate mica mineral found in granites, schists, phyllites & gneisses.
Very light-colored rocks are generally lacking in iron-bearing minerals. ... Then lowgrade metamorphism will convert the iron silicates to the green mineral chlorite. ... Shale is a fine-grained sedimentary rock composed of clay- and silt sized ..... A gneiss is a rock consisting of alternating bands of light and dark minerals.
Jul 17, 2008 ... The preferred orientation of mineral grains in foliated metamorphic rocks ... (f) Composed of alternating bands of light and dark silicate minerals ...