sedimentary
Sandstone with Dendritic Inclusions
Quartzose Sandstone
Hardness of 6-7 on the Mohs scale due to quartz grain composition. Color is generally grey-tan with dark black/brown manganese or iron oxide dendritic markings. Luster is dull to earthy. Granular texture with visible or microscopic clastic grains.
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Physical properties
Hardness of 6-7 on the Mohs scale due to quartz grain composition. Color is generally grey-tan with dark black/brown manganese or iron oxide dendritic markings. Luster is dull to earthy. Granular texture with visible or microscopic clastic grains.
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, primarily quartz, in marine, desert, or river environments over millions of years.
Uses & applications
Used primarily as a decorative stone, building material, and as a fascinating specimen for rock and fossil collectors.
Geological facts
The dark branching patterns often mistaken for fossils are actually dendrites, which are crystal growths formed by the seepage of mineral-rich water through fractures in the rock.
Field identification & locations
Can be identified by its gritty texture, granular appearance, and the presence of fern-like mineral stains. Found globally in sedimentary basins and riverbeds.
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