[Kidney Stone type] Cystine [Population] 1–2%[49] [Circumstances] rare genetic disorder [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. [Color] 
Pink/Yellow
B l a c k / D a r k b r o w n
D i r t y w h i t e
Y e l l o w / R e d d i s h b r o w n
P i n k / Y e l l o w
B r i c k r e d