mineral

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with minor dark inclusions

AI-generated identification · may be incorrect

White to translucent, vitreous-to-dull luster, uneven fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The dark grains may be mica, iron oxides, or another accessory mineral.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Milky quartz crystallizes from silica-rich hydrothermal fluids, while quartzite forms when quartz sandstone is metamorphosed; the specimen’s exact origin and age cannot be determined from the photo. It commonly occurs in veins, pegmatites, and metamorphic terrains.

Uses & applications

Quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive pieces are used as decorative or lapidary material. This small rough specimen has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. White cloudiness usually results from microscopic fluid inclusions or fractures.

Field identification & locations

Likely identification is supported by its white color and granular, hard appearance; a glass-scratch test may confirm quartz, though it can damage surfaces. Common localities include Brazil, the United States, Madagascar, and alpine metamorphic regions.