K-poor meurigite from the Knezska hora quarry near Teskov, western Bohemia, Czech Republic

The rare mineral meurigite was identified at the quarry Knezska hora near T eskov, western Bohemia, Czech Republic. Meurigite forms there elongated tab ular up to flattened acicular crystals, conglomeration of tiny fibres, soft hemispherical aggregates and crusts growing in druse cavities and fissures of quartz gangue. It has light wax yellow colour, some with lemon tint. As sociated minerals are: dufrenite, strengite and cacoxenite. Meurigite from Knezska hora is monoclinic, a = 29.33(1), b = 5.246(2), c = 18.264(7) Angst rom, beta = 109.40(2)degrees, probably with primitive unit cell. The new X- ray powder pattern and unit cell parameters for meurigite from type localit y (Santa Rita mine) are given, too. When compared with meurigite from type locality, meurigite from Knezska hora is K-poor and (CO3)(2-) rich phase. I ts empirical formula is K-0.57(Fe6.65Al0.50)(Sigma 7.15)(PO4)(5.23)(CO3)(0. 81)(OH)(4.71). 6.95 H2O. The infrared spectra and thermogravimetric analysi s of the sample studied are given.