metamorphic
Yellow Quartzite River Stone
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: yellowish-tan due to iron oxide staining; Luster: dull to waxy; Structure: non-foliated granoblastic; Specific Gravity: 2.63-2.65
- Hardness
- 7 on Mohs scale
- Color
- yellowish-tan due to iron oxide staining
- Luster
- dull to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: yellowish-tan due to iron oxide staining; Luster: dull to waxy; Structure: non-foliated granoblastic; Specific Gravity: 2.63-2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen shows high rounding and smoothing from fluvial (river) erosion over many years.
Uses & applications
Commonly used as decorative landscaping rock, track ballast for railroads, and as a durable construction aggregate.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock in weathering processes, often forming the caps of hills and ridges. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its extreme hardness and sandy texture that doesn't rub off. It's found worldwide in ancient mountain belts and riverbeds that drain them. Collectors look for unique colors or water-worn 'worry stone' shapes.
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