| Density | Frequency (n) | Percentage (%) |
| Uric acid | 08 | 04 |
| Magnesium ammonium phosphate | 06 | 03 |
| Calcium oxalate dihydrate | 05 | 02.5 |
| Cystine | 03 | 01.5 |
| Undetermined | 28 | 14 |
| Not specified | 149 | 75 |
| Total | 199 | 100 |