mineral

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent purple/lavender hue; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent purple/lavender hue
Luster: Vitreous (glassy)

Identified June 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous or metamorphic environments, primarily through hydrothermal veins or the cooling of silica-rich magma (pegmatites). This specimen shows iron or manganese staining in fractures, common in alluvial or weathered deposits.

Uses & applications

Raw quartz is used in glassmaking, electronics (piezoelectric properties), and construction. High-quality specimens are used for architectural aggregates, landscaping, or as lapidary material for polishing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Lavender-tinted specimens like this are often considered lower-grade amethyst precursors.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Commonly found in riverbeds, mountains, and mining tailings globally. Collectors look for clarity or unique color zones.