metamorphic
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
Hardness: 7 on Mohs scale. Color: Pink, reddish-pink, or salmon due to hematite. Luster: Vitreous to dull. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6 - 2.7.
- Hardness
- 7 on Mohs scale
- Color
- Pink, reddish-pink, or salmon due to hematite
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Pink, reddish-pink, or salmon due to hematite. Luster: Vitreous to dull. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6 - 2.7.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure cause original quartz grains to recrystallize and fuse together. The pink hue is typically the result of iron oxide (hematite) staining during the initial sedimentary phase or subsequent metamorphic fluid movement.
Uses & applications
Used primarily as decorative stone, crushed stone for road construction, railroad ballast, and occasionally in jewelry as cabochons or tumbled stones. Its extreme durability makes it ideal for landscaping.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, forming prominent ridges and hills. It is often confused with marble, but can be distinguished because quartzite will not react to acid and is much harder.
Field identification & locations
Identify in the field by its grainy, 'sugary' texture and its ability to scratch glass easily. It is commonly found in ancient mountain belts such as the Appalachians, the Great Lakes region (Baraboo Quartzite), and parts of Scandinavia.
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