metamorphic
Coarse-grained mica-bearing metamorphic rock, likely schist
Mica schist, probably muscovite–biotite schist with quartz and feldspar
AI-generated identification · may be incorrectLikely Mohs hardness 2–7 overall; silvery reflective mica flakes, gray-white quartz/feldspar, and possible pink feldspar. Strongly foliated, sparkly micaceous luster, with mica cleavage producing thin sheets; exact mineral proportions are uncertain from the photograph.
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Physical properties
Likely Mohs hardness 2–7 overall; silvery reflective mica flakes, gray-white quartz/feldspar, and possible pink feldspar. Strongly foliated, sparkly micaceous luster, with mica cleavage producing thin sheets; exact mineral proportions are uncertain from the photograph.
Formation & geological history
Formed when shale or other clay-rich sediment was subjected to elevated heat and pressure during regional metamorphism, commonly during mountain building. Its age depends on the source terrane and cannot be determined visually.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally building or facing stone; attractive specimens are collected but are rarely high-value gemstones.
Geological facts
The glitter comes from aligned mica crystals, which can make schist split along foliation planes. Pink areas may be potassium feldspar or iron-stained quartz, while the pale reflective grains may include muscovite.
Field identification & locations
Identify it by visible flaky mica, planar foliation, and alternating light and dark mineral bands; distinguish it from granite by its pronounced fabric. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, Himalaya, and New England.
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