pigeonite
/ˈpɪdʒ(ə)nʌɪt
/noun [mass noun]
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.
Origin
Early 20th century: named after Pigeon Point, Minnesota, + -ite1.
- pineappley
- pineapply
- Pineau
- Pineau des Charentes
- pine bark beetle
- pine barren
- pine-barren beauty
- Pine Barrens
- pine beauty
- pine beetle
- pine blight
- pine blister
- Pine Bluff
- pine bone
- pine-borer
- pine box
- pine-bud moth
- pine bunting
- pine carpet
- pine chafer
- pine cone
- pine-cone fish
- pine drape
- pinedrops
- pine-end