mineral

Milky quartz-bearing rock

Quartz (SiO₂), likely massive quartz with minor iron-oxide inclusions

AI-generated identification · may be incorrect

Typically white to translucent, with a vitreous to waxy luster and irregular fracture; quartz hardness is Mohs 7, lacks cleavage, and has specific gravity about 2.65. The specimen appears massive and granular, with brown staining likely from limonite or hematite.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in a vein or cavity, probably within an igneous or metamorphic host rock; the exact geologic age cannot be determined visually. Weathering produced the iron-oxide surface stains.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are sold as cabinet or lapidary specimens. This rough specimen has limited jewelry value unless it cuts cleanly.

Geological facts

Milky quartz owes its cloudy appearance to microscopic fluid inclusions, fractures, or impurities. It can resemble calcite, but quartz is substantially harder and does not effervesce in dilute acid.

Field identification & locations

Common in quartz veins, pegmatites, hydrothermal deposits, and metamorphic terrains worldwide. Test with a steel file or glass: quartz scratches glass and resists a steel blade; confirm with hardness testing because surface alteration can mislead.