igneous
Feldspar-rich Granite (or Gneiss) Pebble
Granite (primarily Orthoclase Feldspar and Quartz)
Hardness: 6-6.5 (Mohs scale), Color: Salmon-orange to reddish-brown with grey and white inclusions, Luster: Vitreous to dull, Crystal Structure: Phaneritic (visible interlocking crystals), Cleavage: Perfect in two directions for the feldspar component.
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Salmon-orange to reddish-brown with grey and white inclusions, Luster: Vitreous to dull, Crystal Structure: Phaneritic (visible interlocking crystals), Cleavage: Perfect in two directions for the feldspar component.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep within the Earth's crust (intrusive igneous). This specific specimen has been rounded and smoothed by water transport (fluvial or beach erosion), likely dating from the Precambrian to Cenozoic eras depending on the local geology.
Uses & applications
Used in construction, monuments, and as decorative gravel. High-quality specimens are used for countertops and floor tiles. Polished pebbles are often used in landscaping and home decor.
Geological facts
The orange color is caused by the presence of Potassium Feldspar (Orthoclase). Granite is the most abundant basement rock of Earth's continental crust. Over millions of years, these rocks can be transported hundreds of miles by rivers, resulting in the smooth, rounded 'river stone' appearance seen here.
Field identification & locations
Identify by its salt-and-pepper or mottled orange texture and its inability to be scratched by a steel blade. Found globally in mountainous regions, riverbeds, and glacial deposits. Collectors should look for unique crystalline patterns or high quartz content.
