metamorphic
Yellow Quartzite River Stone
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale (scratches glass). Color: Yellowish-brown to tan due to iron oxide impurities. Luster: Vitreous to dull. Crystal structure: Non-foliated, granular. Specific gravity: 2.6 to 2.7.
- Hardness
- 7 on Mohs scale (scratches glass)
- Color
- Yellowish-brown to tan due to iron oxide impurities
- 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 (scratches glass). Color: Yellowish-brown to tan due to iron oxide impurities. Luster: Vitreous to dull. Crystal structure: Non-foliated, granular. Specific gravity: 2.6 to 2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure. This specific specimen has been further shaped through fluvial or coastal erosion, resulting in a smooth, rounded 'cobble' or river stone texture.
Uses & applications
Commonly used in landscaping, as aggregate in road construction, or as decorative river rocks. High-purity quartzite is sometimes used in glassmaking and metallurgy.
Geological facts
Quartzite is so durable that it often remains as mountain peaks after surrounding softer rock has eroded away. It is often mistake for marble, but can be distinguished by its superior hardness.
Field identification & locations
Identify in the field by its grainy, sandpaper-like texture (if fresh break) and its inability to be scratched by a steel knife. Common in riverbeds and ancient glacial deposits.
More like this
