sedimentary
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
Color: Earthy brown with tan inclusions; Luster: Dull/Earthy; Texture: Granular or clastic; Hardness: Variable (likely 3-6 Mohs depending on cementation); Structure: Fragmented/Massive
- Hardness
- Variable (likely 3-6 Mohs depending on cementation)
- Color
- Earthy brown with tan inclusions
- Luster
- Dull/Earthy
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Physical properties
Color: Earthy brown with tan inclusions; Luster: Dull/Earthy; Texture: Granular or clastic; Hardness: Variable (likely 3-6 Mohs depending on cementation); Structure: Fragmented/Massive
Formation & geological history
Formed through the weathering, transport, and deposition of pre-existing mineral or rock particles, followed by lithification through pressure or chemical cementation. Likely derived from local soil or gravel beds.
Uses & applications
Larger deposits are used for road base, concrete aggregate, and general landscaping. Small pebbles are common unintentional debris in residential environments.
Geological facts
Sedimentary rocks cover about 75% of Earth's land surface. This specific specimen appears to be a small clastic fragment that may have been tracked indoors via footwear.
Field identification & locations
Identify in the field by looking for distinct layers (bedding) or grains of sand and silt cemented together. Common in riverbeds, gardens, and under footwear treads.
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