mineral

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on the Mohs scale. Color: Opaque white to cream with reddish-pink iron oxide staining. Luster: Vitreous (glassy) to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: Approximately 2.65.

Hardness: 7 on the Mohs scale
Color: Opaque white to cream with reddish-pink iron oxide staining
Luster: Vitreous (glassy) to waxy

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or cavities within host rocks. This specific specimen shows signs of water-worn weathering, likely found in a riverbed or coastal environment. It can originate from almost any geological age, typically associated with igneous or metamorphic belts.

Uses & applications

Used industrially in glass manufacturing, electronics (due to piezoelectric properties), and as an abrasive. In this tumbled pebble form, it is primarily used for landscaping, decorative gravel, or as a pocket stone for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth. The reddish hues in this specimen are likely hematite or goethite staining.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and cannot be scratched by a steel knife) and its lack of cleavage. Look for it in gravel pits, riverbeds, and mountainous outcroppings. It is a 'foundational' mineral for amateur collectors.

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