mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; 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 translucent
Luster: Vitreous to greasy

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed during the late stages of hydrothermal or pegmatitic igneous activity as silica-rich fluids cool in veins or crustal pockets. Can be found in geological environments ranging from Precambrian to Cenozoic eras.

Uses & applications

Used in the manufacturing of optical instruments, electronics (oscillators), glassmaking, as an abrasive, and widely used in landscaping and crystal collecting.

Geological facts

Milkiness is caused by tiny liquid or gas bubble inclusions trapped during the crystal's growth. It is the most common variety of crystalline quartz on Earth.

Field identification & locations

Identify in the field by its white color, ability to scratch glass, and lack of cleavage (breaks like glass). Commonly found in quartz veins and within granite batholiths worldwide.