metamorphic
Yellow Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Yellow, cream, tan due to iron inclusions; Luster: Vitreous to waxy; Texture: Granular, sugary appearance; Crystal system: Trigonal (microcrystalline)
- Hardness
- 7 on Mohs scale
- Color
- Yellow, cream, tan due to iron inclusions
- Luster
- Vitreous to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellow, cream, tan due to iron inclusions; Luster: Vitreous to waxy; Texture: Granular, sugary appearance; Crystal system: Trigonal (microcrystalline)
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone subjected to high heat and pressure, typically in convergent plate boundaries (orogenic belts). It is common in Precambrian shields.
Uses & applications
Used in construction as crushed stone or decorative ballast, as dimension stone in architecture, and as decorative landscape rocks or palm stones.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, forming ridges and resistant hills. It is often confused with marble but is significantly harder.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of reaction to acid. Often found as rounded river pebbles or cobbles like this specimen, appearing translucent when held to light.
