The new mineral species klöchite was found in a SiO 2 -rich xenolith from a nepheline basanite quarry at the Klöch volcano, Bad Radkersburg district, Styria, Austria. It forms hexagonal tabular crystals flattened on {001}, with a diameter up to 0.3 mm and a maximal thickness of 0.1 mm. It is associated with sanidine, quartz, diopside, fluoro-richterite, titanite, enstatite, forsterite, ilmenite and mottramite. Klöchite is blue, has a vitreous luster, is devoid of cleavage, and is translucent and non-fluorescent; the calculated density is 3.007 g cm -3 . Optically, it is uniaxial negative with v 1.594(1) and 1.590(1) at 589 nm; it is pleochroic with v deep blue and pale yellow. Electron-microprobe analyses gave the composition (K 0.
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