mineral

Milky quartz

Quartz (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 7; translucent white to cream with a vitreous-to-waxy luster and irregular fracture. Trigonal crystal structure; no cleavage. The specimen appears to be a rough, massive fragment.

Identified October 14, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent white to cream with a vitreous-to-waxy luster and irregular fracture. Trigonal crystal structure; no cleavage. The specimen appears to be a rough, massive fragment.

Formation & geological history

Quartz commonly forms as silica-rich fluids fill cracks in igneous or metamorphic rocks, or crystallizes from magma. Its age cannot be determined from the image; quartz occurs in rocks of many geological ages.

Uses & applications

Used in glassmaking, ceramics, electronics, and as an inexpensive decorative or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and has piezoelectric properties, producing an electrical charge under pressure.

Field identification & locations

Identify it by its glassy appearance, hardness (it scratches glass), and lack of cleavage; it commonly occurs in veins and granitic or metamorphic rocks. The surrounding coarse, speckled rock appears granitic, but the image alone cannot confirm its exact composition.