metamorphic
Quartz-rich mica schist
Muscovite–quartz schist, with possible feldspar and iron-oxide staining
AI-generated identification · may be incorrectTypically Mohs hardness 2–7: muscovite flakes are soft and flexible, while quartz is 7. It has a silvery to brown, sparkly micaceous luster, visible foliation, and irregular-to-granular crystal texture; quartz has no cleavage, whereas mica has one perfect cleavage plane.
Identified More metamorphic →
Explore Quartz-rich mica schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically Mohs hardness 2–7: muscovite flakes are soft and flexible, while quartz is 7. It has a silvery to brown, sparkly micaceous luster, visible foliation, and irregular-to-granular crystal texture; quartz has no cleavage, whereas mica has one perfect cleavage plane.
Formation & geological history
Formed when a quartz- and clay-rich sedimentary protolith was regionally metamorphosed under elevated temperature and pressure, producing aligned mica layers; iron oxides caused the rusty-brown staining. The specimen’s exact age cannot be determined from the image and depends on its local bedrock.
Uses & applications
Used locally as decorative stone, aggregate, or road material; attractive pieces may be collected, but it is generally unsuitable for high-value jewelry because schist splits along foliation.
Geological facts
The glitter comes mainly from reflective muscovite or related mica, not necessarily metallic minerals. Breaking or rubbing it may release flaky particles along its foliation.
Field identification & locations
Identify it by its layered fabric, abundant shiny flexible flakes, and contrasting white-gray quartz; a glass-scratch test may show quartz grains scratching glass, while mica does not. Common in regional metamorphic belts worldwide.
More like this
