1) Peridotite 
a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains the only diamonds known to occur in the rock ... [6 related articles]
A variety of peridotite that is found in volcanic pipes which are thought to be intrusions from the
Kimberlite is an igneous rock containing very little silica.
A peridotite containing garnet and olivine and found in volcanic pipes, through which it may come from the upper mantle. It can be associated with diamonds or gold.
[n] - a rare type of peridotite that sometimes contains diamonds
Igneous rock that is ultramafic (containing very little silica); a type of alkaline peridotite with a porphyritic texture (larger crystals in a fine-grained matrix), containing mica in addition to olivine and other minerals. Kimberlite represents the world's principal source of diamonds. Kimberlite is found in carrot-shaped pipelike...
A variety of peridotite; the most common host rock of diamonds.
a variety of micaceous peridotite, low in silica content and high in magnesium content, in which diamonds are formed.