metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz-rich Rock (SiO2)
Hardness: 7 on Mohs scale; Color: white, cream, tan with reddish-brown iron staining; Luster: vitreous to dull; Crystal structure: granular, non-foliated; Cleavage: none (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- white, cream, tan with reddish-brown iron staining
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white, cream, tan with reddish-brown iron staining; Luster: vitreous to dull; Crystal structure: granular, non-foliated; Cleavage: none (conchoidal fracture).
Formation & geological history
Formed through the metamorphism of quartz sandstone. High heat and pressure caused the original quartz grains to recrystallize into a dense, interlocking mosaic of crystals.
Uses & applications
Used in construction as crushed stone for road ballast, as a decorative stone in landscaping, and formerly as an abrasive.
Geological facts
Quartzite is so tough that it often outlasts the mountain ranges in which it is found, remaining as high-standing ridges or resistant boulders. It will scratch glass easily.
Field identification & locations
To identify in the field, look for a rock that is harder than steel, has a grainy texture like sugar but cannot be broken into individual grains, and breaks through the grains rather than around them.
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