mineral
Quartz (massive milky quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectOpaque 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.
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Physical properties
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.
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.
