sedimentary
Sedimentary Pebble (Sandstone)
Clastic Sedimentary Rock (SiO2 dominant)
Hardness: Approx. 6-7 (Mohs scale), Color: Grayish-green with reddish-brown hematite staining, Luster: Dull/Earthy, Crystal Structure: Microcrystalline with visible clasts, Specific Gravity: 2.3-2.6
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Physical properties
Hardness: Approx. 6-7 (Mohs scale), Color: Grayish-green with reddish-brown hematite staining, Luster: Dull/Earthy, Crystal Structure: Microcrystalline with visible clasts, Specific Gravity: 2.3-2.6
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts). The rounded shape indicates significant water transport in a river or coastal environment, likely from the Holocene or Pleistocene era.
Uses & applications
Common river stones are used for decorative landscaping, gravel production, and as aggregate in construction and concrete.
Geological facts
The reddish-brown spots are likely 'Liesegang rings' or hematite inclusions caused by iron-rich water seeping through the porous stone and oxidizing over time.
Field identification & locations
Identify in the field by its rounded, water-worn edges and granular texture. Commonly found in riverbeds, glacial tills, and beaches. For collectors, look for unique mineral patterns like these iron stains.
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