Lithogenic bile has the following properties -
Bile salts and phospholipids in bile keep cholesterol in solution by the formation of micelles.
An excess of cholesterol relative to bile salts and phospholipids allows cholesterol to form crystals and such pile is called Lithogenic or super-saturated bile.

Pathogenesis of Cholesterol gallstones 

There are three elements necessary for the formation of cholesterol gallstones


Lithogenic bile
Nucleation and
Stasis or gallbladder hypomotility
↑ Bile and cholesterol ratio
↓Bile and cholesterol ratio
Equal bile and cholesterol ratio
↓Cholesterol only
↓Bile and cholesterol ratio