metamorphic
Yellow Quartzite
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: yellowish-orange with white frosting; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Cleavage: None; Specific Gravity: 2.63-2.65.
- Hardness
- 7 on Mohs scale
- Color
- yellowish-orange with white frosting
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: yellowish-orange with white frosting; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Cleavage: None; Specific Gravity: 2.63-2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. The yellow coloration is typically due to iron oxide impurities (limonite or goethite) within the quartz matrix.
Uses & applications
Used as decorative stone in landscaping, crushed stone for road construction, and occasionally as a gemstone in rough jewelry carvings.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the tops of ridges and mountains because it resists erosion better than the surrounding rocks.
Field identification & locations
Identify in the field by its ability to scratch glass and its sugary, granular appearance on broken surfaces. It does not fizz with acid, distinguishing it from marble. Common in folded mountain belts globally.
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