sedimentary
Red Sandstone Pebble
Sedimentary quartz sandstone
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale due to quartz content; reddish-brown color from iron oxide (hematite) cement; dull to earthy luster; clastic texture with visible rounded grains; no true cleavage.
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Physical properties
Hardness of 6-7 on the Mohs scale due to quartz content; reddish-brown color from iron oxide (hematite) cement; dull to earthy luster; clastic texture with visible rounded grains; no true cleavage.
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, often in desert or river environments, dating across various geological periods from Paleozoic to Mesozoic.
Uses & applications
Commonly used in landscaping, decorative gravel, and as a natural specimen for rock collections.
Geological facts
The distinctive red color comes from iron oxide coating the sand grains, often indicating deposition in a terrestrial, oxygen-rich environment such as an ancient desert.
Field identification & locations
Easily identified in the field by its granular texture, reddish color, and resistance to scratching by a steel knife. Frequently found along riverbeds, beaches, and sedimentary rock outcrops.
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