kimberlite: a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia
peridotite: a dark coarse-grained igneous rock consisting principally of olivine
sphenoid fontanelle: the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified