mineral

Banded Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White/Translucent with grey/black bands; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: White/Translucent with grey/black bands
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White/Translucent with grey/black bands; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids deposit layers in rock cavities or veins. The banding represents changes in mineral concentration or impurities during growth.

Uses & applications

Used primarily in lapidary work, jewelry (cabochons), and as a collector's specimen. High-purity quartz is also used in electronics and glass manufacturing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Banded varieties like this are often precursor forms to agate if the banding becomes more rhythmic and finer.

Field identification & locations

Identify by its hardness (ability to scratch glass) and lack of cleavage. Common in riverbeds and mountainous regions globally. Look for the distinct crystalline texture within the white bands.