metamorphic
Quartz with Schist Inclusion
Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist
Hardness: 7 (Quartz) to 2.5 (Schist); Color: White/translucent with black/grey inclusions; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: None for quartz, basal for schist flakes.
- Hardness
- 7 (Quartz) to 2
- Color
- White/translucent with black/grey inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (Quartz) to 2.5 (Schist); Color: White/translucent with black/grey inclusions; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: None for quartz, basal for schist flakes.
Formation & geological history
Formed under high pressure and temperature where quartz veins intruded into surrounding metamorphic rock (schist). The quartz crystalized around fragments of the host rock, which may be millions of years old.
Uses & applications
Decorative collecting, educational specimens, and occasionally used in lapidary work for unique 'jewelry with character.'
Geological facts
Inclusions like the dark schist seen here are effectively 'frozen' snapshots of geological activity, showing how one rock type invaded another during tectonic shifts.
Field identification & locations
Identify by the contrast between the hard, glass-like quartz and the soft, flaky dark mineral inclusions. Found in high-grade metamorphic terrains such as the Appalachian or Himalayan ranges.
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