a pyroxene mineral.
The crystal structure consists of chains of corner-linked SiO4 tetrahedra, bonded to M1 octahedra.
The bonding between tetrahedral chains and M1 chains is strong, forming cohesive structural "I-beam" units. Adjacent I-beams are connected via M2 sites: this bonding is relatively weak, giving pyroxenes pronounced cleavage.
Crystal structure from Wyckoff: Crystal Structures, Vol. 4.
Mg resides in M1 site; Ca in M2 site.
Crystal Structure Data
Unit Cell Parameters
Fractional Coordinates of Atoms in the Asymmetric Unit
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