mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; typically colorless or white when pure, but can be tinted yellowish-brown due to impurities; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; typically colorless or white when pure, but can be tinted yellowish-brown due to impurities; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments, most commonly as a primary mineral in felsic igneous rocks like granite, in hydrothermal veins, and as detrital grains in sedimentary rocks due to its high resistance to weathering.
Uses & applications
Used extensively in jewelry, ornamental carvings, electronics (oscillator crystals), glassmaking, and abrasive products.
Geological facts
Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. Its varieties include amethyst, citrine, smoky quartz, and rose quartz.
Field identification & locations
Easily identified in the field by its characteristic hardness (scratches glass easily), lack of cleavage, and conchoidal fracture. Commonly found in riverbeds, beaches, and mountainous regions worldwide.
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