metamorphic
Gold-bearing mica schist (probable)
Mica schist, chiefly muscovite/biotite with quartz and feldspar; possible iron-oxide staining
AI-generated identification · may be incorrectTypically Mohs 2–3 for mica and 6–7 for quartz; glittery foliated texture, bronze-gold sheen, uneven surface, and variable gray-brown color. Mica flakes show platy cleavage and pearly to vitreous luster; the image alone cannot confirm native gold.
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Physical properties
Typically Mohs 2–3 for mica and 6–7 for quartz; glittery foliated texture, bronze-gold sheen, uneven surface, and variable gray-brown color. Mica flakes show platy cleavage and pearly to vitreous luster; the image alone cannot confirm native gold.
Formation & geological history
Formed when shale or mica-rich sediment was regionally metamorphosed under elevated pressure and temperature, commonly during mountain building; age depends on locality and may range from Precambrian to younger Paleozoic–Mesozoic rocks.
Uses & applications
Used locally as decorative stone, aggregate, or architectural material; attractive specimens are collected, but ordinary schist has modest commercial value. Gold-bearing material may have assay value only if native gold is confirmed.
Geological facts
The bright flecks may be reflective mica rather than gold; gold is dense, malleable, and remains yellow in shadow, whereas mica flakes readily split and may appear silvery or brassy.
Field identification & locations
Look for strong planar foliation, flakes that peel with a knife, and quartz-rich bands. Common in metamorphic belts worldwide, including the Appalachians, Rockies, Alps, and Precambrian shields; a streak, hardness, density, and assay test are needed to verify gold.
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