mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to pinkish-orange (due to iron oxide); Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to pinkish-orange (due to iron oxide)
Luster: Vitreous to greasy

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal solutions or the cooling of magma in igneous intrusions. This specimen appears water-worn, likely from a stream bed or glacial deposit. Geological age varies by locality, ranging from Precambrian to Cenozoic.

Uses & applications

Used industrially as a source of silicon for glass, electronics, and abrasives. In jewelry, it is often tumbled or cut into cabochons. Frequently used in landscaping and as decorative rock.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The pink/orange staining on this specimen is not internal Rose Quartz, but a surface deposit of Limonite or Hematite (iron oxides).

Field identification & locations

Identify by its hardness (it will scratch glass and steel knife blades) and lack of cleavage. Found globally in almost all geological environments. Collectors look for well-formed crystals or those with interesting mineral inclusions.

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