mineral
Quartz crystals on matrix
Silicon dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal structure: Trigonal (often forms hexagonal prisms with pyramidal terminations); Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Colorless to white
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal structure: Trigonal (often forms hexagonal prisms with pyramidal terminations); Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Forms in a wide range of geological environments, including igneous, metamorphic, and sedimentary rocks. Often precipitates from hydrothermal fluids into cavities and fractures.
Uses & applications
Collected for display; quartz is also used extensively in glassmaking, electronics (as oscillators), and construction materials.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These specific specimens often form in vugs or geodes.
Field identification & locations
Identify by its hardness (scratches glass), six-sided crystal shape, and lack of cleavage. Found worldwide.
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