Pyrope, augite, and hornblende occur as xenocrysts in a volcanic breccia of Whaingaroan (Lower Oligocene) age at Kakanui. The pyrope has the composition Py66·4Al20·0Gr10·9An2·1Sp0·6;n= 1 · 741;D= 3 · 72;a= 11·536 Å. The augite is an aluminous variety with tschermakitic affinities; α = 1·686, β = 1·691, γ = 1·713; optically positive, 2V = 55°;D= 3·33. The hornblende is a hastingsite; α = 1·676, β = 1·687, γ = 1·695; optically negative, 2V = 80°;D= 3·22. The occurrence and associations of these minerals suggest that they originated in the upper mantle.