How Do I Identify My Kimberlite Stone?

Kimberlite is a type of igneous rock that is associated with the formation of diamonds. If you think you have found a kimberlite stone, there are a few characteristics you can look for to help identify it:

1. Look for a blueish-green color: Kimberlite often has a distinctive blueish-green color due to the presence of minerals such as serpentine and chlorite. However, it’s worth noting that not all kimberlite is blueish-green, and some may be grey, brown or black.
2. Check for a porphyritic texture: Kimberlite often has a porphyritic texture, which means it has larger crystals surrounded by smaller ones. This is because kimberlite forms deep in the earth and is subjected to high pressure and temperature, which causes the crystals to grow slowly over time.
3. Examine the surface texture: Kimberlite can have a rough, pitted surface due to the way it is formed. The magma that forms kimberlite rises rapidly to the surface, causing the gas bubbles within the magma to expand and burst, creating a frothy texture.
4. Look for a volcanic pipe: Kimberlite is typically found in volcanic pipes, which are narrow, vertical columns of rock that rise from deep within the earth. These pipes are often associated with other volcanic rocks such as basalt and tuff.
5. Test for diamond presence: While the presence of diamonds in a kimberlite stone does not guarantee that it is a diamond-bearing kimberlite, it can be a strong indication. One way to test for diamond presence is to use a black light, which can make the diamonds fluoresce.

It’s important to note that identifying a kimberlite stone requires expertise and specialized equipment. If you believe you have found a kimberlite stone, it’s best to consult with a geologist or a diamond exploration company for a proper identification.

In conclusion, identifying a kimberlite stone involves looking for its blueish-green color, porphyritic texture, surface texture, volcanic pipe, and diamond presence. However, this is not a straightforward process, and expert help is usually required.