metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: Yellow/Tan; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- Yellow/Tan
- Luster
- Vitreous to dull
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale); Color: Yellow/Tan; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further smoothed by fluvial (river) or coastal erosion, creating a 'river stone' texture.
Uses & applications
Used primarily in decorative landscaping, aquarium gravel, as a construction aggregate, or as a pocket stone for collectors.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the caprock or peaks of mountain ranges. It is tougher than the sandstone it originated from because the individual sand grains have recrystallized and fused together.
Field identification & locations
Identify in the field by its inability to be scratched by steel, its sugary texture if broken, and its lack of reaction to acid. It is found globally in mountainous regions or riverbeds.
More like this
