mineral
Kidney Stone
Calculus (Calcium oxalate/Calcium phosphate)
Hardness varies depending on composition, often brown, tan, or yellowish. Can have a crystalline or smooth surface.
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Physical properties
Hardness varies depending on composition, often brown, tan, or yellowish. Can have a crystalline or smooth surface.
Formation & geological history
Formed in the human body (kidneys) from dissolved minerals in urine.
Uses & applications
No practical purpose; indicates a medical condition.
Geological facts
Kidney stones have afflicted humans for millennia and can be quite painful to pass.
Field identification & locations
Identified medically via imaging or physical recovery. Not a collector's item in the traditional sense.
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