metamorphic
Quartz with Schist/Mica Inclusions
Crystalline Silicon Dioxide (SiO2) with Phyllosilicates
Hardness: 7 (Quartz), 2-3 (Mica); Color: Milky white with silver-grey and black inclusions; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture on quartz parts)
- Hardness
- 7 (Quartz), 2-3 (Mica)
- Color
- Milky white with silver-grey and black inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (Quartz), 2-3 (Mica); Color: Milky white with silver-grey and black inclusions; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture on quartz parts)
Formation & geological history
Formed through regional metamorphism or hydrothermal vein activity where quartz crystals grew alongside or enveloped existing mica schist minerals under high pressure and temperature.
Uses & applications
Primarily of interest to mineral collectors and as a decorative landscape stone; quartz is also used in glassmaking and electronics.
Geological facts
Small flakes of mica within quartz can create an effect known as aventurescence, though when the pieces are large like this, they are simply called inclusions. Mica is one of the few minerals that can be peeled into paper-thin transparent sheets.
Field identification & locations
Identified by the scratch-resistant white quartz matrix and the shiny, flaky silver-grey inclusions that can be scratched with a fingernail. Commonly found in riverbeds and mountainous regions like the Appalachians or the Alps.
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