metamorphic
Quartzite
Quartzite (SiO2)
AI-generated identification · may be incorrectHardness: 7, Color: Orange to reddish-orange (due to iron oxide inclusions), Luster: Vitreous to greasy, Crystal structure: Granular, interlocking quartz grains, Cleavage: None (fractures conchoidally to uneven), Specific gravity: 2.6-2.7
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Physical properties
Hardness: 7, Color: Orange to reddish-orange (due to iron oxide inclusions), Luster: Vitreous to greasy, Crystal structure: Granular, interlocking quartz grains, Cleavage: None (fractures conchoidally to uneven), Specific gravity: 2.6-2.7
Formation & geological history
Formed from quartz-rich sandstone that has been subjected to high heat and pressure during regional or contact metamorphism.
Uses & applications
Used in construction as a decorative stone, for countertops, flooring, and wall covering. Also collected as a polished or tumbled stone.
Geological facts
Quartzite is a very hard and durable rock, making it highly resistant to weathering. The orange color in this specimen is likely due to the presence of iron oxide (rust) within the rock.
Field identification & locations
Can be identified by its granular texture, hardness (it will scratch glass), and typical colors ranging from white to gray, pink, red, or orange depending on impurities. Commonly found in areas of past tectonic activity.
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