metamorphic
Micaceous schist (probable)
Mica schist, dominated by muscovite/biotite with quartz and feldspar
AI-generated identification · may be incorrectTypically silver-gray to brown, with a glittery micaceous luster and pronounced foliation; mica is Mohs 2–3, quartz about 7, and the specimen likely has moderate density (~2.7–3.0). Visible flaky surfaces and irregular splitting are characteristic.
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Physical properties
Typically silver-gray to brown, with a glittery micaceous luster and pronounced foliation; mica is Mohs 2–3, quartz about 7, and the specimen likely has moderate density (~2.7–3.0). Visible flaky surfaces and irregular splitting are characteristic.
Formation & geological history
Formed when shale or other clay-rich sediment was subjected to regional metamorphism, commonly during mountain building; its exact geological age cannot be determined from the photograph. Mica schist occurs in metamorphic belts worldwide.
Uses & applications
Used locally as decorative stone, landscaping material, and aggregate, though strongly foliated pieces are generally unsuitable for structural construction. Attractive specimens are collected for their sparkle and texture.
Geological facts
The shimmering appearance comes from aligned mica flakes reflecting light; individual flakes may peel or flex slightly. Dark grains could represent biotite, while pale glittering grains are likely muscovite or quartz.
Field identification & locations
Identify it by strong planar foliation, abundant visible mica, glittery reflections, and relatively soft flaky layers; a streak, hardness, and acid test would improve identification. Common regions include the Appalachians, New England, the Alps, and other ancient mountain belts.
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