[Population] 5–10% [Circumstances] when urine is persistently acidic [Color] Yellow/Reddish brown [Sensitivity] Radiolucent [Details] Diets rich in animal proteins and purines: substances found naturally in all food but especially in organ meats, fish, and shellfish. [Kidney Stone type] 
Uric acid
C a l c i u m o x a l a t e
C a l c i u m p h o s p h a t e
U r i c a c i d
S t r u v i t e
C y s t i n e
X a n t h i n e [ 5 0 ]