metamorphic
Beach Quartzite (Yellow-stained Quartz)
Quartzite (SiO2 with Iron oxide staining)
Hardness: 7 (Mohs scale); Color: Tan to yellowish-orange due to iron staining; Luster: Vitreous to waxy; Structure: Granitoid/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7.
- Hardness
- 7 (Mohs scale)
- Color
- Tan to yellowish-orange due to iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Tan to yellowish-orange due to iron staining; Luster: Vitreous to waxy; Structure: Granitoid/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7.
Formation & geological history
Originates from quartz-rich sandstone subjected to extreme heat and pressure (metamorphism). The rounded shape is a result of mechanical weathering through wave action (abrasion) on a beach environment over thousands of years.
Uses & applications
Used primarily as decorative aggregate in landscaping, aquarium stones, or as a pocket stone/talisman. In industrial forms, crushed quartzite is used in road construction and glass manufacturing.
Geological facts
Quartzite is so durable that it often survives long after the surrounding softer rocks have eroded away. The yellow hue is typically caused by 'limonite' or other iron oxides leaching into the microscopic spaces between the quartz grains.
Field identification & locations
Identify in the field by its hardness (will scratch glass easily) and its sugary/granular texture under a magnifying lens despite being polished smooth by the ocean. Common on beaches with high-energy waves.
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