metamorphic
Quartzite with Iron Banding
Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)
Hardness: 7 on Mohs scale; Color: Tan to light brown with red/burgundy iron oxide bands; Luster: Vitreous to dull; Crystal structure: Granular/Granoblastic; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Tan to light brown with red/burgundy iron oxide bands
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to light brown with red/burgundy iron oxide bands; Luster: Vitreous to dull; Crystal structure: Granular/Granoblastic; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the metamorphism of quartz sandstone under intense heat and pressure. The red bands indicate the presence of hematite or other iron oxides that were present in the parent sedimentary layers.
Uses & applications
Commonly used in construction as crushed stone, road ballast, or decorative landscaping stone. High-purity quartzite is used in glass making.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the ridges and peaks of mountain ranges because it weathers much more slowly than surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and its grainy, sandpaper-like texture that does not rub off. Found commonly in areas of ancient tectonic activity such as the Appalachian or Rocky Mountains.
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