= 667.65 Å3; Z = 2 for pure Mg hydroxyl-clinohumite. The odd setting of space group P21/c is chosen to preserve the a and b axes of olivine. The structure is closely related to that of olivine as well as the other humite minerals. Mg and Fe are in octahedral coordination with oxygen and silicon (Si) is in tetrahedral coordination. There are five distinct octahedral sites and two different tetrahedral sites. One of the octahedral sites is bonded to two OH,F atoms and is the site where Ti is partitioned. Clinohumite is a nesosilicate with no oxygen atoms shared between two silicons. See also Alleghanyite Chondrodite Humite Jerrygibbsite References Magnesium minerals Iron(II) minerals Gemstones Humite group Monoclinic minerals Minerals in space group 14