Abstract
Titanian clinohumite (Ti-Chu) represents a stable constituent of the greenschist facies assemblage antigorite (Atg)-forsterite (Fo)-diopside (Di)-magnetite (Mag) in serpentinites of the Zermatt area, Central Switzerland. The red-brown fluorine-free mineral occurs as small grains within pseudomorphs after primary clinopyroxene, small corroded relics of which are still present. The clinopyroxene (Cpx) replacement by Ti-Chu can be described by a schematic reaction $$Cpx + H_2 O + O_2 \Rightarrow Ti - Chu + Atg + Di + Mag$$
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