igneous
Quartz-rich breccia or vein quartz with dark inclusions
Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals
AI-generated identification · may be incorrectHardness about 7; white to gray, opaque to translucent, with a vitreous-to-waxy luster and irregular fracture. The angular pale fragments and dark mineral-rich zones suggest brecciation rather than a single uniform crystal mass.
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Physical properties
Hardness about 7; white to gray, opaque to translucent, with a vitreous-to-waxy luster and irregular fracture. The angular pale fragments and dark mineral-rich zones suggest brecciation rather than a single uniform crystal mass.
Formation & geological history
Formed when silica-rich hydrothermal fluids filled and cemented fractures, incorporating broken host rock; alteration and iron oxidation produced the rusty staining. Its exact geological age cannot be determined from the photograph and depends on its source locality.
Uses & applications
Primarily a common collector specimen or decorative stone; quartz-rich material may be used as aggregate, silica feedstock, or ornamental stone when sufficiently pure.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a strong piezoelectric effect. The dark areas may contain biotite, amphibole, chlorite, or manganese/iron oxides.
Field identification & locations
Identify by its glassy fracture, great hardness, and inability to scratch with a steel knife; angular fragments and mineral-filled seams support a breccia interpretation. Common in hydrothermal veins and metamorphic terrains worldwide.
