mineral

Bicolor Quartz Tumble

Silicon Dioxide (SiO2)

Hardness: 7 Mohs; Color: White/Grey with Black carbon or manganese inclusions; Luster: Vitreous to dull; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture.

Hardness: 7 Mohs
Color: White/Grey with Black carbon or manganese inclusions
Luster: Vitreous to dull

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White/Grey with Black carbon or manganese inclusions; Luster: Vitreous to dull; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within pegmatites. The two-tone appearance suggests a change in mineral environment or an inclusion of carbonaceous material during growth.

Uses & applications

Primarily used as a pocket stone, in decorative arrangements, or for crystal collecting. High-grade quartz is used in electronics and glass-making.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Bicolor specimens often occur at the boundary layers of mineral veins.

Field identification & locations

Identify by its hardness (scratches glass) and lack of cleavage. Look for the distinct transition between the translucent white and the opaque dark zones.