mineral
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Creamy white to brownish-red with translucency; Lustre: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Creamy white to brownish-red with translucency
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Physical properties
Hardness: 7 on Mohs scale; Color: Creamy white to brownish-red with translucency; Lustre: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic cavities or by chemical precipitation in sedimentary basins. This specimen shows signs of iron staining, suggesting weathering in an oxidising environment.
Uses & applications
Used widely in manufacturing glass, ceramics, and abrasives. Higher quality pieces are used as semi-precious gemstones (Chalcedony/Agate) or as decorative stones in landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its conchoidal (shell-like) fracture pattern made it a primary material for prehistoric tool-making, such as arrowheads and scrapers.
Field identification & locations
Identify in the field by its ability to scratch glass and its lack of cleavage. It is extremely common globally, found in almost all geological environments. Collectors look for unique banding or crystal growth.
