metamorphic
Mica Schist with Garnet
Almandine-Mica Schist
Hardness: 2.5-4 (Schist matrix) to 6.5-7.5 (Garnets); Color: Silvery-gray, brownish-red; Luster: Pearly to metallic (mica) and vitreous (garnet); Structure: Foliated/Schistose; Cleavage: Perfect basal on mica flakes.
- Hardness
- 2
- Color
- Silvery-gray, brownish-red
- Luster
- Pearly to metallic (mica) and vitreous (garnet)
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Physical properties
Hardness: 2.5-4 (Schist matrix) to 6.5-7.5 (Garnets); Color: Silvery-gray, brownish-red; Luster: Pearly to metallic (mica) and vitreous (garnet); Structure: Foliated/Schistose; Cleavage: Perfect basal on mica flakes.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (shales) at high temperatures and pressures within the Earth's crust, typically during mountain-building events.
Uses & applications
Used as a decorative stone, in landscaping, and as a source of industrial garnet for abrasives; primarily a collector's specimen common in geology education.
Geological facts
The 'sparkly' appearance is due to parallel alignment of mica minerals like biotite and muscovite. This specimen appears to contain small, dark red Almandine garnets embedded in the flakes.
Field identification & locations
Identify by its distinct layered (foliated) texture and reflective, flaky surface that peels in thin sheets. Commonly found in metamorphic belts such as the Appalachian or Himalayan mountains.
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