metamorphic
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
Hardness: 2-4 (Mohs), Color: Gold, silver-grey, brown, Luster: Pearly to metallic, Structure: Foliated with visible flaky texture, Cleavage: Perfect basal cleavage in individual mica grains.
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Physical properties
Hardness: 2-4 (Mohs), Color: Gold, silver-grey, brown, Luster: Pearly to metallic, Structure: Foliated with visible flaky texture, Cleavage: Perfect basal cleavage in individual mica grains.
Formation & geological history
Formed during regional metamorphism of clay-rich sedimentary rocks like shale or mudstone under high pressure and temperature. Mostly associated with Paleozoic or Proterozoic mountain-building events.
Uses & applications
Used in construction as a decorative facing stone or flagstone, and in industry for electrical insulation (sheet mica) or as a filler in paints and plastics.
Geological facts
Mica schist is famous for its 'sparkle' due to the alignment of mica crystals. It was often used by ancient civilizations for decoration and mirrors due to its reflective properties.
Field identification & locations
Identify by its characteristic shimmery, foliated appearance and thin, flaky layers that can be scratched off with a fingernail. Common in Appalachian and Himalayan mountain ranges.
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