mineral

Milky quartz

Quartz (SiO₂), massive variety

AI-generated identification · may be incorrect

Usually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The specimen appears massive and may include minor iron-oxide staining or calcite-like alteration.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in fractures, veins, cavities, or pegmatites; most examples are Precambrian to Phanerozoic in age. The exact locality and age cannot be determined from the photograph.

Uses & applications

Used as an ornamental stone, lapidary material, countertop aggregate, and silica source; attractive translucent pieces are collected or polished. This rough specimen has modest commercial value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. It is distinct from calcite because quartz is much harder and does not effervesce in dilute hydrochloric acid.

Field identification & locations

Likely quartz if it scratches glass and leaves no powdery residue; inspect for glassy fracture and test hardness on an inconspicuous area. Common worldwide in hydrothermal veins, granites, pegmatites, and metamorphic rocks.