mineral

Milky quartz crystal with iron-oxide inclusions

Quartz (SiO₂), likely limonite/goethite-stained inclusions

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous to somewhat dull luster, massive-to-crystalline hexagonal quartz structure, and no true cleavage. The rusty brown markings are likely iron oxides coating fractures or inclusions.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids in veins, cavities, and pegmatites; iron minerals later oxidize to produce the brown staining. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive crystals are sold for mineral collecting and decoration. This modest specimen has primarily educational or ornamental value.

Geological facts

The pointed, faceted form is consistent with a naturally terminated or partly shaped quartz crystal, though the surface appears somewhat worn or polished. Iron staining can strongly enhance otherwise colorless or milky quartz.

Field identification & locations

Identify it by its glassy appearance, hexagonal crystal habit, white translucency, hardness sufficient to scratch glass, and rusty fracture staining; common sources include Brazil, Madagascar, the United States, and worldwide hydrothermal veins.