metamorphic
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Arenite (SiO2)
Hardness: 7 on Mohs scale; Color: Reddish-brown with white vein; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Reddish-brown with white vein
- 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 on Mohs scale; Color: Reddish-brown with white vein; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure. The white band is a secondary quartz vein formed by hydrothermal fluids filling a fracture in the host rock. Often found as water-worn pebbles in riverbeds or beaches.
Uses & applications
Used primarily as decorative landscaping stone, in construction as crushed stone, and sometimes as a minor gemstone for tumbling or cabochons.
Geological facts
Quartzite is so tough that it usually breaks through the quartz grains rather than around them. The reddish color is typically due to trace amounts of iron oxide (hematite) staining the grains.
Field identification & locations
Identify in the field by its extreme hardness (cannot be scratched by a steel knife) and the presence of a distinct mineral vein perpendicular to grain. Commonly found in glacial till or along high-energy shorelines.
More like this
