The specific gravity of kimberlite varies depending on its composition and the presence of minerals like olivine, pyroxene, and garnet. However, it generally falls within the range of 2.8 to 3.2.

Here's a breakdown:

* Average Specific Gravity: 2.9 to 3.1

* Range: 2.8 to 3.2

It's important to note that these are just estimations. The specific gravity of a particular kimberlite sample can vary.