metamorphic
Quartzite (with Quartz Veining)
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: grayish-white with tan weathering; Luster: vitreous to dull; Crystal structure: granular, non-foliated; Cleavage: none (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- grayish-white with tan weathering
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: grayish-white with tan weathering; Luster: vitreous to dull; Crystal structure: granular, non-foliated; Cleavage: none (conchoidal fracture).
Formation & geological history
Formed via the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen shows secondary quartz veining and significant water-worn weathering from a beach or river environment.
Uses & applications
Commonly used in construction as crushed stone, for railroad ballast, and occasionally as decorative stone or in glassmaking if high purity.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock, forming resistant ridges. It is harder than steel and can easily scratch glass.
Field identification & locations
Identify by its extreme hardness and granular 'sugary' texture. Commonly found in mountainous regions or as water-rounded cobbles on beaches.
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