Abstract
Single crystals of andradite, having the morphology of tetragon-trioctahedron, were found in sandstone bed and skarn-pebbles therein of typical Triassic Ladinian formation at Kurobayama, Onoda city, Yamaguchi Prefecture, west Japan. The largest crystal is 1.5 cm across and 3.78 g in weight. An example of chemical analyses for the andradite is given as follows :(Ca22.65Mg0.11Fe0.662+Mn0.40)23.82(Fe15.963+Al0.14)16.10Si24.02O96.00Lattice parameter. 12.042 A, specific gravity 3.58, refractive index 1.8830 and magnetic susceptibility 60×10-6 emu/g are obtained. The growth, dislocation and deformation history of this garnet was analysed from the surface microtopographic features left on the as-grown surface. The finding of this garnet suggests the existence of skarn-type ore deposit and its related acidic plutonism during the periods between late Permian and middle Triassic in the western region of Yamaguchi Prefecture.
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