X-ray powder data for sepiolite are indexed on the basis of an orthorhombic cell. The mineral shows marked variations in crystallinity. Single crystal, electron diffraction diagrams confirm the b and c parameters, and in conjunction with electron microscope observations prove that the lath-like crystals develop on the (100) plane.

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First page of <italic>x</italic>-ray and electron diffraction data for sepiolite<xref ref-type="fn" rid="fn1">*</xref>
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