metamorphic
Mica Schist with Pyrite and Quartz
Metamorphic Rock (Muscovite-Biotite Schist)
Hardness varies by mineral component (Quartz is 7, Mica is 2-2.5 on Mohs scale); color ranges from silvery-gray to brownish-gold with metallic specks; luster is pearly to metallic; crystal structure is foliated, flaky, and crystalline.
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Physical properties
Hardness varies by mineral component (Quartz is 7, Mica is 2-2.5 on Mohs scale); color ranges from silvery-gray to brownish-gold with metallic specks; luster is pearly to metallic; crystal structure is foliated, flaky, and crystalline.
Formation & geological history
Formed through regional metamorphism of argillaceous (clay-rich) sedimentary rocks like shale or mudstone under intense heat and directional pressure, typically over hundreds of millions of years.
Uses & applications
Used primarily in educational geology kits, decorative landscaping stone, electrical insulation components (from sheet mica), and as mineral specimens for rock collectors.
Geological facts
Schist is characterized by its prominent foliation, meaning its mineral grains readily split into thin flakes or layers. The golden metallic specks often found embedded in these rocks are frequently iron pyrite, commonly known as 'fool's gold.'
Field identification & locations
Easily identified in the field by its sparkling, flaky appearance due to abundant mica flakes and its tendency to break along parallel planes. Commonly found in ancient mountain belts and regional metamorphic terranes worldwide.
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