Quartzolite

[1]: 135 [2] Typically, quartz forms more than 60% of the rock,[3] the rest being mostly feldspar although minor amounts of mica or amphibole may also be present.

[2] Quartzolite occurs as dykes, sills, veins, bosses and segregation masses;[3][4] it is also found in association with greisen and pegmatite.

[9] The use of the synonym "silexite" is discouraged because it is the French word for chert, which is a sedimentary rock.

One type forms dykes and sills in the granite and in the surrounding metamorphic rocks.

The other type has remnants of an earlier granite texture and is found on the outer edges of part of the pluton.