mineral
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
Mohs hardness of 7, vitreous (glassy) to greasy luster, trigonal crystal system, conchoidal fracture, white to translucent/clear appearance, specific gravity around 2.65
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Physical properties
Mohs hardness of 7, vitreous (glassy) to greasy luster, trigonal crystal system, conchoidal fracture, white to translucent/clear appearance, specific gravity around 2.65
Formation & geological history
Forms in a wide variety of geological environments including igneous pegmatites, hydrothermal veins, and metamorphic rocks as mineral-rich fluids cool and crystallize.
Uses & applications
Widely used in electronics (piezoelectric applications), glass manufacturing, abrasives, gemstone jewelry, and decorative rock collections.
Geological facts
Quartz is the second most abundant mineral in the Earth's continental crust. Its name comes from the German word 'Quarz', which is of Slavic origin.
Field identification & locations
Identified by its ability to scratch glass (hardness 7), distinct conchoidal fracture, lack of true cleavage, and typical translucent white to clear appearance. Found worldwide.
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