metamorphic
Quartzite with Chlorite and Iron Staining
Quartzite (SiO2) with Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2
Hardness: 7 (Mohs scale), Color: Dirty white to grey with green and brown patches, Luster: Vitreous to dull, Structure: Granular/Crystalline
- Luster
- Vitreous to dull, Structure: Granular/Crystalline
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Physical properties
Hardness: 7 (Mohs scale), Color: Dirty white to grey with green and brown patches, Luster: Vitreous to dull, Structure: Granular/Crystalline
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, often found in mountain belts where tectonic activity occurs.
Uses & applications
Commonly used as crushed stone in construction, road ballast, or as a decorative stone in landscaping.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in a landscape, leading to the formation of ridges and summits.
Field identification & locations
Identified by its extreme hardness (cannot be scratched by steel) and lack of reaction to acid. Often found in riverbeds or near mountain outcrops.
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