Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & Geological History

Formed in hydrothermal veins or pegmatites when silica-rich fluids cool. The milky color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. Common in tectonic and volcanic environments.

Uses & Applications

Used as a gemstone (tumbled or cabochon), in glassmaking, as an abrasive, and in the electronics industry for its piezoelectric properties. It is also popular in landscaping and as a mineral specimen.

Geological Facts

Quartz is the most abundant mineral in Earth's continental crust. Milky quartz is specifically white because it contains millions of microscopic bubbles or fluid inclusions that scatter light.

Field Identification & Locations

Identify by its white color, inability to be scratched by steel, and lack of cleavage (it breaks in irregular shards). It is found globally in mountainous regions, riverbeds, and as veins in other rocks.

Identified on: 5/2/2026

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