metamorphic
Quartz (Quartzite)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to milky white with reddish-brown staining; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Tan to milky white with reddish-brown staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to milky white with reddish-brown staining; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, causing the original sand grains to recrystallize into a dense, interlocking matrix of quartz crystals.
Uses & applications
Used in construction as crushed stone for roadbeds, in the manufacturing of glass, as an abrasive, and is highly valued as a gemstone or collector specimen in its pure forms.
Geological facts
Quartz is one of the most abundant minerals in the Earth's crust. This specific specimen appears to be waterworn, suggesting it may have been transported by a river or stream over a long period.
Field identification & locations
Identify in the field by its high hardness (it will easily scratch glass) and lack of cleavage. Look for the granular, sugary texture typical of quartzite compared to the smoother appearance of chert.
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