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Pyroxenoid

Minerals composed of single chains of SiO₄ tetrahedrons having 3-, 5-, 7-, or 9-periodicity. Minerals with single chains with no periodicity correspond to Pyroxene supergroup. A part of oxgen atoms may be replaced by OH.

[A_N][(SiO₃)_N]

N = 3, 5, 7, 9

• [ N ]
• N = 1 (No periodicity): corresponds to Pyroxene supergroup.
• N = 3 (3-periodic): Wollastonite, Bustamite, Ferrobustamite, Pectolite, Sérandite (Serandite), Tanohataite, Cascandite
• N = 5 (5-periodic): Rhodonite, Babingtonite, Manganbabingtonite, Scandiobabingtonite, Nambulite, Natronambulite, Marsturite, Lithiomarsturite
• N = 7 (7-periodic): Pyroxmangite, Pyroxferroite

• Class: Inosilicate subclass < Silicate class
• Class: Inosilicate
• System: Triclinic