metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Pinkish-white to tan with reddish iron staining; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-white to tan with reddish iron staining
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-white to tan with reddish iron staining; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, quartz grains recrystallize and fuse together. The pinkish hue usually comes from iron oxide impurities (hematite). Found across all geological ages, often in mountain belts.
Uses & applications
Used as a decorative stone in landscaping, as an aggregate in road construction, and occasionally for interior countertops or stone carvings due to its durability and aesthetics.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, forming prominent ridges or hilltops. It is frequently mistaken for marble but can be distinguished by its superior hardness.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of reaction to acid. It has a grainy, sugary appearance but breaks through the quartz grains rather than around them. Common in Precambrian shields and mountain ranges worldwide.
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