sedimentary
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
Hardness 6-7 on Mohs scale, greyish-pink to beige color, dull to sugary earthy luster, granular texture made of rounded quartz sand grains, specific gravity approximately 2.2-2.8.
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Physical properties
Hardness 6-7 on Mohs scale, greyish-pink to beige color, dull to sugary earthy luster, granular texture made of rounded quartz sand grains, specific gravity approximately 2.2-2.8.
Formation & geological history
Formed by the deposition, compaction, and cementation of mineral or rock fragments (predominantly quartz) in marine, beach, or riverbed environments. Later rounded by water erosion into a beach or river pebble.
Uses & applications
Used widely as landscaping gravel, decorative stone, construction aggregate, and as a rounded pocket stone for collectors.
Geological facts
Sandstone composed mostly of quartz grains is known as quartzarenite. Over millions of years, water action smooths these fragments into perfectly rounded pebbles like this specimen.
Field identification & locations
Identified by its distinctly grainy, sandpaper-like surface and uniform rounded shape. Commonly found on coastlines, lake shores, and riverbeds worldwide.
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