kimberlite
Type Intrusive brecciated "igneous" rock.
Chemistry Ultramafic.
Components Minerals: serpentinized olivine,phlogopite,pyrope garnet,pyroxene,chromite,melilite, diamond,garphite,calcite,monticellite
Occurrence show at picture of Thailand.
accesory mineralscomponents usually present in an igneous rock,but in minor abundance;their presence is not essential to the definition of the rock.
accidental minerals minirals present,even in largequantity,but not usually found in a particular rock type;may be foreign mineral engulfed by invading magma(xenocryst).