metamorphic
Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: typically white to gray, often with yellow or pink tints; Luster: vitreous to dull; Structure: non-foliated, granular; Cleavage: none; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- typically white to gray, often with yellow or pink tints
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: typically white to gray, often with yellow or pink tints; Luster: vitreous to dull; Structure: non-foliated, granular; Cleavage: none; Specific Gravity: 2.6-2.7
Formation & geological history
Formed when quartz-rich sandstone is subjected to heat, pressure, and chemical activity of metamorphism, leading to the recrystallization of the sand grains.
Uses & applications
Extensively used as a decorative stone in construction, for counter tops, flooring, and as crushed stone for road aggregate and railway ballast.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the capstones of mountain ranges and ridges; it is harder and more durable than the parent sandstone.
Field identification & locations
Identify in the field by its extreme hardness (cannot be scratched by steel) and lack of foliation. It is commonly found in mountain belts and areas of ancient continental crust.
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