metamorphic
Quartzite Countertop
Quartzite (SiO2 dominated)
Hardness: 7 on Mohs scale; Color: Grayish-white with swirling patterns; Luster: Vitreous to dull; Texture: Granoblastic; Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Grayish-white with swirling patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Grayish-white with swirling patterns; Luster: Vitreous to dull; Texture: Granoblastic; Specific gravity: 2.6-2.7.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events in the Precambrian or Paleozoic eras.
Uses & applications
Extensively used in construction as dimension stone, flooring, and bathroom or kitchen countertops due to its durability and aesthetic appeal.
Geological facts
Quartzite is often mistaken for marble due to its appearance, but it is much harder and more resistant to acid etching (like lemon juice).
Field identification & locations
Identified by its high hardness (it scratches glass) and lack of reaction to dilute hydrochloric acid. Commonly found in metamorphic fold belts worldwide.
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