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A calcium-poor pyroxene mineral occurring chiefly in basalt.‘Orthopyroxene forms in primitive (high-MgO) basalts but as differentiation proceeds, it is replaced by pigeonite once the enstatite component falls below 60 to 70 atomic percent.’
- ‘Various factors, including magma composition, control whether orthopyroxene or pigeonite occurs as the low-Ca pyroxene, but high temperatures yield orthopyroxene and low-pressure crystallization favours pigeonite.’
- ‘Pigeonite is the orthorhombic pyroxene equivalent in the volcanic rocks.’
- ‘There appear to be a number of different possible mechanisms for the pigeonite - orthopyroxene transformation.’
- ‘This contrasts with the first-order character for the HT phase transition in pigeonite containing significantly less calcium.’
Early 20th century named after Pigeon Point, Minnesota, + -ite.
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