mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
Mohs hardness: 7. Color: Colorless/Transparent. Luster: Vitreous. Crystal structure: Trigonal/Hexagonal. Specific gravity: 2.65. Cleavage: None (conchoidal fracture).
- Hardness
- 7
- Color
- Colorless/Transparent
- Luster
- Vitreous
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Physical properties
Mohs hardness: 7. Color: Colorless/Transparent. Luster: Vitreous. Crystal structure: Trigonal/Hexagonal. Specific gravity: 2.65. Cleavage: None (conchoidal fracture).
Formation & geological history
Forms through the cooling of silica-rich magma or in hydrothermal veins and geothermal waters. It is found in igneous, metamorphic, and sedimentary environments worldwide across geological ages.
Uses & applications
Extensively used in jewelry (as a gemstone), crystal healing, precision electronics (piezoelectric properties), and glass manufacturing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Clear quartz is often called 'Rock Crystal.' Ancient Greeks believed it was ice that had hardened so much it would never melt.
Field identification & locations
Identify by its hardness (scratches glass), clarity, and lack of cleavage. Tumbled specimens are smooth and rounded through mechanical polishing. Found globally, with major deposits in Brazil and Arkansas.
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