the humite group. They also increase with Fe2+ and Ti4+ and with (OH)− substituting for F−. Dispersion: r > v. Environment Chondrodite is found largely in metamorphic contact zones between carbonate rocks and acidic or alkaline intrusions where fluorine has been introduced by metasomatic processes. It is formed by the hydration of olivine, (Mg,Fe2+)2SiO4, and is stable over a range of temperatures and pressures that include those existing in a portion of the uppermost mantle. Titanian chondrodite has been found as inclusions in olivine in serpentinite in West Greenland, where it is associated with clinohumite, olivine, magnesite, magnetite and Ni-Co-Pb sulfides in a matrix of antigorite. See also Clinohumite Alleghanyite Humite Classification of minerals List of minerals References Magnesium minerals Iron minerals Humite group Monoclinic minerals Minerals in space group 14 Luminescent minerals