mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to milky with orange/brown iron oxide staining, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified May 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool in veins and cracks of host rocks. This specimen likely came from a quartz vein and shows surface oxidation from exposure to water and iron-rich minerals.

Uses & applications

Used in glassmaking, abrasives, and as a component in concrete. Often collected by hobbyists or used in decorative landscaping; high-purity quartz is used in electronics and clocks.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These specific specimens are often called 'Gold Quartz' by prospectors because iron-stained quartz veins are frequently associated with gold deposits.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and translucent 'milky' appearance. It is found globally in almost all geological environments but is most prominent in vein deposits.

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