Pyrolite
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Pyrolite is a term used to characterize a model composition of the Earth's mantle. This model is based on that a pyrolite source can produce the Mid-Ocean Ridge Basalt by partial melting.[1][2] It was first proposed by Ted Ringwood (1962)[3] as being 1 part basalt and 4 parts harzburgite, but later was revised to being 1 part tholeiitic basalt and 3 parts dunite.[1][4] The term is derived from the mineral names PYR-oxene and OL-ivine.[5] However, whether pyrolite is representative of the Earth's mantle remains debated.[6]