metamorphic
Quartzite with Quartz Veining
Metamorphosed Sandstone (primarily SiO2)
Hardness: 7 (Mohs scale), Color: White to grayish-tan with translucent patches, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture.
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Physical properties
Hardness: 7 (Mohs scale), Color: White to grayish-tan with translucent patches, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, causing quartz grains to recrystallize into a dense interlocking mosaic. Common in mountainous regions and tectonic belts.
Uses & applications
Used in construction as crushed stone or ballast, in high-end countertops, and for manufacturing glass or silicon components due to high silica content.
Geological facts
Quartzite is so tough that it often outlasts surrounding rocks through erosion, forming the caps of ridges and mountains. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify by its extreme hardness and grainy look that doesn't rub off. It is commonly found in riverbeds or glacial till. Collectors look for pieces with interesting patterns or vugs containing visible crystals.
