mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

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

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in igneous, metamorphic, and sedimentary environments. Primarily crystallizes from cooling magma or hydrothermal veins. This specimen likely originated from a hydrothermal vein or a pegmatite dike.

Uses & applications

Used in glass making, ceramics, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry or for decorative home decor.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. The 'milky' appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), glassy luster, and lack of cleavage. Found globally, especially in mountain ranges and riverbeds as eroded stones.