The light-color layers within a typical gneiss are formed by __.
A) amphiboles
B) feldspars
C) pyroxenes
D) olivine
E) calcite

Question

Quizplus · Accepted Answer

The light-color layers within a typical gneiss are formed by feldspars. Gneiss is a metamorphic rock that is formed from the regional metamorphism of igneous or sedimentary rocks. The layers in gneiss are often made up of alternating light and dark mineral bands, with the light bands generally composed of feldspar and the dark bands composed of mafic minerals such as biotite, amphibole, or pyroxene.

The Light-Color Layers Within a Typical Gneiss Are Formed by __