metamorphic
Riverstone Quartz (Quartzite)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to yellowish-green waxy translucence; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Tan to yellowish-green waxy translucence
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to yellowish-green waxy translucence; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often reshaped by fluvial (river) erosion which rounds the edges and smooths the surface.
Uses & applications
Commonly used as decorative landscaping stone, in construction as aggregate, or as tumbled pocket stones for metaphysical purposes.
Geological facts
Quartzite is one of the most physically durable and chemically resistant rocks found on Earth's surface. When sandstone is metamorphosed into quartzite, the individual quartz grains recrystallize into a silica-cemented mosaic.
Field identification & locations
Identify by its hardness (it will scratch glass) and waxy, smooth appearance. Commonly found in riverbeds, glacial deposits, and mountain outcrops. Use a scratch test to distinguish from softer stones like calcite or jadeite.
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