Gneiss can be differentiated from schist by the amount of this mineral present.
Gneiss can be differentiated from schist by the amount of this mineral present. Along with quartz and foid, two major types of this mineral make up the QAPF diagram for classifying granites. One type of this mineral is the last one on the continuous arm of Bowen's Reaction Series, and varieties of this mineral include labrodorite and anorthosite. For 10 points, name this most abundant class of minerals in the earth's crust, consisting of orthoclase and plagioclase varieties.
Gneiss can be differentiated from schist by the amount of this mineral present.
{feldspars}