mineral

Quartz-rich rock, likely milky quartz with iron-oxide staining

Quartz (SiO₂), possibly quartzite or a quartz vein fragment

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. Reddish-brown coating and veins are likely hematite/goethite staining; the granular texture may indicate quartzite rather than a single crystal.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich hydrothermal fluids filling fractures, or from metamorphism and recrystallization of sandstone into quartzite. The specimen’s exact geological age and locality cannot be determined from the image alone.

Uses & applications

Used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as décor or lapidary rough. This example appears common and has modest commercial value.

Geological facts

Milky quartz becomes opaque when microscopic fluid inclusions or structural defects scatter light. Iron oxides commonly stain quartz surfaces orange, red, or brown.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; a steel nail should not scratch it. Common in quartz veins and metamorphic terrains worldwide.