metamorphic
Quartzite with Quartz Veining
Metamorphosed Quartz-rich Sandstone (SiO2)
Hardness: 7 on Mohs scale; Color: Grey to brownish-white with translucent white veins; Luster: Dull/earthy for the matrix, vitreous for the veins; Crystal Structure: Granular/Massive; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Grey to brownish-white with translucent white veins
- Luster
- Dull/earthy for the matrix, vitreous for the veins
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Physical properties
Hardness: 7 on Mohs scale; Color: Grey to brownish-white with translucent white veins; Luster: Dull/earthy for the matrix, vitreous for the veins; Crystal Structure: Granular/Massive; Specific Gravity: 2.6-2.7
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, causing recrystallization. The white veins are typically hydrothermal quartz that filled fractures in the rock at a later stage.
Uses & applications
Used as a decorative stone, in construction as crushed stone or road ballast, and as a source for industrial silica.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the ridges and peaks of mountain ranges. It is harder than steel and will easily scratch a glass plate.
Field identification & locations
Identified in the field by its sugary texture and extreme hardness. Look for it in glaciated regions or riverbeds where it survives as durable cobbles. It will scratch glass, unlike similar-looking limestone which would fizz with acid.
