mineral

Quartz with Mica

Silicon Dioxide (SiO2) with Phyllosilicates (Mica)

Hardness: 7 (Quartz); Color: White to milky with black or silver flecks; Luster: Glassy to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture on quartz, basal on mica flakes).

Hardness: 7 (Quartz)
Color: White to milky with black or silver flecks
Luster: Glassy to greasy

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes or during the final stages of cooling in igneous rocks like granite or pegmatites. It commonly crystallizes in veins or pockets within the Earth's crust over millions of years.

Uses & applications

Quartz is used in glassmaking, electronics, silicon production, and as an abrasive. Specimens with mica are popular for educational purposes, collection, and landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The presence of mica gives it a characteristic sparkle when viewed under light.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and the shiny, plate-like black or brown flakes of mica. Common in mountain stream beds and rocky outcrops and is a staple for amateur rock hounding.

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