TITANCLINOHUMITE FROM FUJIWARA ULTRABASIC COMPLEX IN THE HIGASHI-AKAISHI MOUNTAINLAND, SHIKOKU, JAPAN

Clinohumite is found in serpentinite near Fujiwara village, Ehime Prefecture, which belongs to the central part of the Sambagawa metamorphic terrane. The mineral forms as vein or lenticular aggregate in serpentinite and shows reddish brown to dark brown in color.Under microscope, it shows strong pleochroism and dispersion, some crystals have lamella twins parallel to 001. The refractive indices are α=1.637, β=1.645-1.648, γ=1.669 and γ-α=0.032.Chemical composition and X-ray powder data of the clinohumite are presented and genetic relation of coexisting minerals are discussed in this paper.