metamorphic

Foliated quartz-mica schist

Quartz–muscovite/biotite schist, commonly with feldspar

AI-generated identification · may be incorrect

Typically gray to silvery, with sparkly mica and a foliated, flaky texture; quartz and feldspar are Mohs 6–7, mica 2–3. It has a vitreous to pearly luster, weakly developed cleavage in quartz-rich areas, and schistosity from aligned mica grains.

Identified September 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or felsic volcanic sediment underwent regional metamorphism under elevated temperature and pressure, commonly during mountain building. Its age depends on locality and may range from Precambrian to Paleozoic or younger.

Uses & applications

Mostly used as a decorative or teaching specimen; durable quartz-rich varieties may be used locally as dimension stone, but strong foliation limits construction applications.

Geological facts

The visible glitter comes from mica flakes reflecting light, while the layered appearance records deformation and mineral alignment during metamorphism.

Field identification & locations

Identify it by its glittery mica, wavy foliation, and ability to split along mica-rich layers; common in metamorphic mountain belts worldwide. A precise identification requires a fresh surface, hardness testing, and often a hand lens.