Ultramafic rock but there are ultrapotassic and highly silica-under-saturated rocks with >18% MgO which can be considered "ultramafic". Ultrapotassic, ultramafic igneous rocks such as lamprophyre, lamproite and kimberlite are known to have reached the surface of the Earth. Although no modern eruptions have been observed, analogues are preserved. Most of these rocks occur as dikes, diatremes, lopoliths or laccoliths, and very rarely, intrusions. Most kimberlite and lamproite occurrences occur as volcanic and subvolcanic diatremes and maars; lavas are virtually unknown. Vents of Proterozoic lamproite (Argyle diamond mine), and Cenozoic lamproite (Gaussberg, Antarctica) are known, as are vents of Devonian lamprophyre (Scotland). Kimberlite
Grammy Award for Best Male Rock Vocal Performance with the award more than any other nationality, though it has been presented to musicians from the United Kingdom four times, from Australia once, and from South Africa once. Each year is linked to the article about the Grammy Awards held that year. Grammy Award for Best Male Rock Vocal Performance The Grammy Award for Best Male Rock Vocal Performance was an award presented at the Grammy Awards, a ceremony that was established in 1958 and originally called the Gramophone Awards, to male recording artists for works (songs or albums) containing quality vocal performances in the rock music genre. Honors