Abstract
Reflections from X-ray and electron diffraction patterns of intergrowths of rhodonite and pyroxmangite are diffuse parallel to c*. Relatively sharp reflections correspond to ordered rhodonite or pyroxmangite. High resolution lattice fringe images show that units of rhodonite and pyroxmangite are intergrown as thin lamellae less than 300Å thick with (001) in common. Broadening of the powder X-ray lines and variation in the observed optical angle, 2V, are explained on the basis of the lamellar structure of the two minerals.
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