metamorphic
Quartzite river stone
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: yellowish-brown with dark banding; Luster: dull to vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: none; Specific gravity: approx 2.65.
- Hardness
- 7 on Mohs scale
- Color
- yellowish-brown with dark banding
- Luster
- dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: yellowish-brown with dark banding; Luster: dull to vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: none; Specific gravity: approx 2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events. This specimen has been rounded and smoothed by fluvial or alluvial water erosion.
Uses & applications
Commonly used as decorative landscaping stone, in aggregate for road construction, or as a polished pocket stone for collectors. High-purity quartzite is used in glass and silicon manufacturing.
Geological facts
Quartzite is one of the most durable rocks on Earth's surface. This specific specimen features a distinct dark mineral line, likely an iron oxide or organic inclusion from the original sedimentary layers.
Field identification & locations
Identified by its high hardness (cannot be scratched by a steel blade) and its granular, sugary texture under magnification. Found globally in riverbeds, glacial deposits, and mountain ranges.
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