[Population] 1–2%[49] [Circumstances] rare genetic disorder [Color] Pink/Yellow [Sensitivity] Radio-opaque [Details] Cystine, an amino acid (one of the building blocks of protein), leaks through the kidneys and into the urine to form crystals. [Kidney Stone type] 
Cystine
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 ]