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 ...
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 ...
This page is a glossary of geology. Main article: Geology. Main category: Geology terminology ... Anorthite - The lime rich end of the plagioclase group of minerals; Silicate of calcium .... basalt. d) Diabase. e) Any dark, igneous rock composed chiefly of silicates of iron and ... Light minerals (Quartz & Feldspar) > 60% - Acid.
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.
10) Select the coarse-grained rock which is composed mainly of quartz and .... 34 ) ______ is composed of alternating bands of light and dark silicate minerals.
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.
a conglomerate b shale c chert d none of these 25 Which pair of minerals is ... ______ is composed of alternating bands of light and dark silicate minerals. a.
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?
The preferred orientation of mineral grains in foliated metamorphic rocks ... (f) Composed of alternating bands of light and dark silicate minerals - gneiss (g) Hard ...
Banded, Alternating bands of light and dark-colored minerals ... Biotite is a black or dark brown silicate rich in iron, magnesium, potassium, aluminum, and silica. ... Chemical sedimentary rocks, Sedimentary rock composed of minerals that ...