igneous/metamorphic
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
Hardness: Quartz (7) and Mica (2.5-3); Color: White to translucent with silvery-grey flakes; Luster: Vitreous to pearly; Crystal Structure: Hexagonal (Quartz) and Monoclinic (Mica); Specific Gravity: ~2.65
- Hardness
- Quartz (7) and Mica (2
- Color
- White to translucent with silvery-grey flakes
- Luster
- Vitreous to pearly
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Physical properties
Hardness: Quartz (7) and Mica (2.5-3); Color: White to translucent with silvery-grey flakes; Luster: Vitreous to pearly; Crystal Structure: Hexagonal (Quartz) and Monoclinic (Mica); Specific Gravity: ~2.65
Formation & geological history
Formed through the cooling of magma in pegmatites or through regional metamorphism. Often found in continental crust environments where silica and aluminum are abundant.
Uses & applications
Used primarily as decorative specimens, in landscaping, or as a source for industrial silica and insulating mica. Larger, clearer specimens may be used in jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Mica is famous for its perfect basal cleavage, allowing it to split into extremely thin, flexible sheets.
Field identification & locations
Identify by checking if the white parts scratch glass (quartz) and if the dark/silvery flakes can be peeled or scratched with a fingernail (mica). Commonly found in granite outcrops.
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