metamorphic
Quartzite with Hematite staining
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: White to tan with reddish-pink streaks; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: None (conchoidal fracture); High durability.
- Hardness
- 7 on Mohs scale
- Color
- White to tan with reddish-pink streaks
- Luster
- Vitreous to dull
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: White to tan with reddish-pink streaks; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: None (conchoidal fracture); High durability.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. High heat and pressure cause the quartz grains to recrystallize and fuse together. The reddish color is due to iron oxide (hematite) staining.
Uses & applications
Used as a decorative stone in landscaping, as a construction aggregate, for railroad ballast, and sometimes in countertop manufacturing.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, forming ridges and resistant peaks. It is frequently mistaken for marble but can be distinguished by its superior hardness.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary texture. Common in metamorphic belts globally. Collectors value specimens with vibrant mineral coloring.
