mineral

Milky quartz with iron-stained matrix

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, vitreous to waxy luster, and no cleavage; it has a hexagonal crystal structure, though this specimen is massive and granular. Brown-orange areas are likely iron-oxide staining or attached feldspathic rock.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or pegmatitic melts crystallize in fractures and cavities; quartz is abundant from Precambrian to recent geological settings. The rough matrix suggests growth in a host-rock vein or pocket.

Uses & applications

Used for glass, electronics, abrasives, engineered stone, and ornamental specimens; attractive translucent pieces may be cut or polished, though this example appears mainly collectible.

Geological facts

Milky quartz contains microscopic fluid inclusions, fractures, or defects that scatter light and produce its cloudy appearance. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and hardness sufficient to scratch ordinary glass; a steel nail will not scratch it. Common worldwide, especially in hydrothermal veins and pegmatites.