mineral
Quartz (Milky Quartz / Quartz Specimen)
Silicon Dioxide (SiO2)
Mohs hardness of 7, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, white to semi-translucent milky appearance, specific gravity around 2.65
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Physical properties
Mohs hardness of 7, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, white to semi-translucent milky appearance, specific gravity around 2.65
Formation & geological history
Forms through magmatic crystallization in igneous pegmatites, hydrothermal veins, and metamorphic rocks across various geological eras.
Uses & applications
Used extensively in glassmaking, electronics (piezoelectric applications), abrasives, jewelry, lapidary arts, and gemstone collections.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear (rock crystal), while inclusions, structural defects, or radiation cause various color varieties.
Field identification & locations
Can be identified by its ability to scratch steel and glass (hardness 7), lack of cleavage, and characteristic conchoidal fracture. Found globally in granites, sandstones, quartzites, and quartz veins.
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