mineral

Quartz (massive milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent white-gray mass with a vitreous to dull luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, specific gravity about 2.65. The image appears to show a rough, weathered specimen; its exact identity cannot be confirmed from appearance alone.

Identified September 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-rich hydrothermal veins and cavities, and in igneous and metamorphic rocks; quartz occurs across geological ages. The pale coating or patches may be weathering or another mineral.

Uses & applications

Commonly used in glassmaking, ceramics, electronics, and as a decorative or lapidary material; attractive pieces may be polished or collected.

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of many sands and rocks.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and conchoidal fracture. It is found worldwide, especially in veins and pegmatites; the photo does not show diagnostic crystal faces.