igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Hardness: 6-7 Mohs; Color: Tan to pinkish groundmass with black specks; Luster: Dull (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Groundmass has poor cleavage, though individual minerals within vary; Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 Mohs
- Color
- Tan to pinkish groundmass with black specks
- Luster
- Dull (weathered) to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to pinkish groundmass with black specks; Luster: Dull (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Groundmass has poor cleavage, though individual minerals within vary; Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface (intrusive). This specific specimen has been rounded and smoothed by water or glacial transport. Geological age can range from Precambrian to Cenozoic depending on the source pluton.
Uses & applications
Used widely in construction as crushed stone, dimension stone for countertops and monuments, and as a durable material for landscaping. Small pebbles like this are primarily used for decorative gravel or garden paths.
Geological facts
Granite is the most common rock in the Earth's continental crust. Over time, erosion exposes these subterranean formations, and natural forces مانند rivers break them down into smooth river stones or pebbles.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible crystal grains of varying colors. It resists scratching by steel and is commonly found in riverbeds, glacial deposits, and mountain ranges. This specimen is a typical 'river rock'.
