mineral

Milky quartz with a dark mica-rich band

Quartz (SiO₂), likely with biotite or another dark mica; host rock uncertain

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy quartz with an irregular dark band; quartz hardness 7 Mohs and no cleavage. The image alone does not establish crystal structure or the exact dark mineral.

Identified October 5, 2026More mineral →

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Physical properties

White to translucent, glassy-to-waxy quartz with an irregular dark band; quartz hardness 7 Mohs and no cleavage. The image alone does not establish crystal structure or the exact dark mineral.

Formation & geological history

Quartz commonly forms in hydrothermal veins and pegmatites; the band may represent an inclusion or adjacent mica-rich material. Geological age and specific formation setting cannot be determined from the specimen alone.

Uses & applications

Commonly collected as a hand specimen; quartz is widely used in glass, electronics, and abrasives, while attractive pieces may be used decoratively.

Geological facts

Milky appearance results from light scattering by microscopic inclusions or fractures. A streak or hardness test could help distinguish quartz from softer look-alikes.

Field identification & locations

Check whether it scratches glass and whether the dark band flakes into thin sheets (suggesting mica). Quartz occurs worldwide, but the specimen’s locality is unknown.