igneous
Tumbled quartz-rich pebble
Likely quartzite or quartz-rich sandstone; predominantly SiO₂
AI-generated identification · may be incorrectHardness about 7 if quartzite (6–7 overall); rounded, pinkish-tan, fine-grained, and dull to weakly satin luster. No visible cleavage; likely interlocking quartz grains, though the photograph cannot confirm composition.
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Physical properties
Hardness about 7 if quartzite (6–7 overall); rounded, pinkish-tan, fine-grained, and dull to weakly satin luster. No visible cleavage; likely interlocking quartz grains, though the photograph cannot confirm composition.
Formation & geological history
Probably a naturally water-worn and/or commercially tumbled pebble derived from quartzite or sandstone. Quartz-rich rocks commonly form from metamorphosed sandstone or lithified sediment; age is indeterminate.
Uses & applications
Used as a decorative tumbled stone, landscaping pebble, craft material, or inexpensive specimen; quartzite also serves as aggregate and building stone.
Geological facts
The pink color may result from iron oxides or minor feldspar. A glass-scratch test and streak, hardness, and acid testing would help distinguish quartzite from softer sandstone or other pink stones.
Field identification & locations
Common in streambeds, gravel deposits, and landscaping products worldwide; inspect for sugary quartz texture and test whether it scratches glass. Exact identification requires a fresh surface or magnification.
