metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, colors range from white and gray to pink, red, or green, vitreous to greasy luster, non-foliated massive crystal structure, conchoidal fracture, specific gravity around 2.65
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Physical properties
Hardness of 7 on the Mohs scale, colors range from white and gray to pink, red, or green, vitreous to greasy luster, non-foliated massive crystal structure, conchoidal fracture, specific gravity around 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in mountain-building or tectonic collision zones over millions of years
Uses & applications
Used in construction, road aggregate, manufacturing of silica brick, railroad ballast, and occasionally as an ornamental decorative stone or countertop material
Geological facts
Quartzite is extremely resistant to weathering and chemical agents, which is why quartz sandstone ridges often weather out as prominent resistant mountain ridges
Field identification & locations
Can be identified in the field by its high hardness (scratches glass easily), lack of significant foliation, and sugary textured interlocking quartz grains that break across rather than around the grains
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