metamorphic
Quartz-rich metamorphic rock, likely mica schist
Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar
AI-generated identification · may be incorrectGray-green, sparkly, and foliated with platy mica flakes and granular quartz; quartz has Mohs hardness 7, mica 2–3, nonmetallic vitreous to pearly luster, and strong cleavage in mica. The rounded surface indicates it is water-worn or tumbled.
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Physical properties
Gray-green, sparkly, and foliated with platy mica flakes and granular quartz; quartz has Mohs hardness 7, mica 2–3, nonmetallic vitreous to pearly luster, and strong cleavage in mica. The rounded surface indicates it is water-worn or tumbled.
Formation & geological history
Formed when a clay- or feldspar-rich sedimentary protolith was buried and regionally metamorphosed under elevated heat and pressure, commonly during mountain building; its exact geological age cannot be determined from the photograph.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally dimension stone; attractive hand specimens are collected, but it is not typically a gemstone.
Geological facts
The glitter comes from aligned mica sheets reflecting light, while the resistant quartz grains produce the rough granular texture. Foliation may appear as subtle layers or directional sparkle.
Field identification & locations
Look for visible aligned mica flakes, easy splitting along foliation, and mixed dark/light grains; common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalaya.
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