mineral

Milky quartz (possibly iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent cream with vitreous-to-waxy luster and conchoidal fracture. Hexagonal crystal structure, though this specimen appears massive and lacks visible cleavage; rusty areas likely iron-oxide staining.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or pegmatites, commonly in igneous and metamorphic rocks. Quartz is widespread from Precambrian to modern geological settings; exact age cannot be determined from the image.

Uses & applications

Used for glass, ceramics, abrasives, electronics, countertops, and ornamental carving; attractive pieces are sold as cabinet specimens. It has modest jewelry value unless unusually clear or well-crystallized.

Geological facts

Quartz is the second-most abundant mineral in Earth’s continental crust and is highly resistant to weathering. Milky opacity usually results from microscopic fluid inclusions or fractures.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and inability to scratch with a steel nail; it should scratch ordinary glass. Common worldwide, especially in quartz veins, pegmatites, and hydrothermal deposits.