We can barite sulfate lumps for both chemical and drilling grades as shown below: Type A: BaSo4: 92.84 - Specific Gravity: 4.4 (g/cm3) Type B: BaSo4: 82.99 - Specific Gravity: 4.22 (g/cm3) Type C: BaSo4: 88.73.84 - Specific Gravity: 4.34 (g/cm3) Type D: BaSo4: 86.63.84 - Specific Gravity: 4.28 (g/cm3)