igneous
Pink Rhyolite
Rhyolite (High-silica volcanic rock)
Hardness: 6-7 on Mohs scale; Color: Pink, reddish, or tan; Luster: Dull or earthy; Crystal structure: Aphanitic (fine-grained) often with phenocrysts; Cleavage: None/Conchoidal fracture.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, reddish, or tan
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, reddish, or tan; Luster: Dull or earthy; Crystal structure: Aphanitic (fine-grained) often with phenocrysts; Cleavage: None/Conchoidal fracture.
Formation & geological history
Extrusive igneous rock formed by the rapid cooling of silica-rich (felsic) magma at or near the Earth's surface. Usually associated with continental volcanic eruptions.
Uses & applications
Used as a crushed stone for construction, road grit, and occasionally as a decorative landscape stone or lapidary material.
Geological facts
Rhyolite has the same chemical composition as granite but cooled much faster, preventing large crystals from forming. It is often associated with explosive volcanic activity due to its high viscosity.
Field identification & locations
Identify by its fine-grained texture, light pink/red color, and lack of visible grains to the naked eye. Found in volcanic regions like the Rocky Mountains, Andes, and Iceland.
