perodotite

Yes. Kimberlite will dissolve in acid.

No. Most volcanoes do not have kilberlite. Kimberlite is a rather unusual form of igneous rock found primarily in kimberlite pipes.

Kimberlite is a rare, blue-tinged, coarse-grained intrusive igneous rock that often contains diamonds. Some kimberlite deposits have been found in Western Kenya.

Nonoxizied Kimberlite is called Blue Ground, due to the blue color..Oxizdized Kimberlite is called Yellow ground due to the yellow color. It is a deep Tawny Yellow.