metamorphic
Red Quartzite River Stone
Metamorphic Rock (composed mainly of Quartz, SiO2)
Hardness: 7 on Mohs scale; Color: Pinkish-red, maroon, or purple due to iron oxide inclusions; Luster: Vitreous to dull; Crystal structure: Non-foliated interlocking quartz crystals; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-red, maroon, or purple due to iron oxide inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-red, maroon, or purple due to iron oxide inclusions; Luster: Vitreous to dull; Crystal structure: Non-foliated interlocking quartz crystals; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The rounded shape indicates extensive erosion and transport in a fluvial (river) or glacial environment.
Uses & applications
Used as decorative garden stone, landscape gravel, crushed stone for road construction, and occasionally in architecture or as abrasive medium.
Geological facts
Quartzite is so durable that it often remains behind after softer rocks have eroded away, forming high ridges or resistant 'monadnocks'. The red color often comes from hematite (Fe2O3) staining during formation.
Field identification & locations
Identify by its ability to scratch glass and lack of reaction to acid. It is found globally in mountainous and glaciated regions. Collectors look for smooth, well-rounded specimens with unique color patterns.
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