454 IIYEEOUS SILICATES. 289. FAU.TASITE.—Faujassite ; Dufrenoy. Faujasit; Hausmann, Haidinger. Pyramidal. 101,001 = 52° 45'. e 101. fig. 449. ee" 105° 30' ee' 68 30 Twin. Twin-face e. Fracture uneven. Transparent... translucent on the edges. Lus tre vitreous, inclining to adamantine. Colour less, white, brown. Brittle, ii = S'o. g — 1-923. In the matrass yields water. Before the blowpipe intu- mesces and melts into a white enamel. Is decomposed by hydrochloric acid. Analyses by Damour, the mineral in the latter being more free from impurity than in the former:— Silica .... . . . 49'36 46-12 Alumina . . . . . . 1677 16-81 Lime .... . . . 5-00 4'79 Soda .... . . . 4-34 6‘09 Water . . . . . . 22-49 27-02 Is found in the cavities of an amygdaloidal rock at Sassbach on the Kaiserstuhl in the Breisgau. According to Blum, the crystals of faujasite belong to the cubic system. Simple form 0 ill. 290. HAKMOTOME.—Harmotome ; Phillips, Hauy. Pa- ratomer Kuphon-Spath; Mohs. Harmotom; Hausmann, Hai dinger. Prismatic. 011,010 =54° 23'; 101,001 = 34° 47'; 110,100 = 45° 63'. a 100, b 010, s 101, t 201, p 111, m 110 twin-face, v 414. v truncates the edge sp. FIG. 460. ab 90° o' If sa 65 13 \ r / ss' 69 34 I " | ta 36 46 » 1 1 tt' 108 30 O' e\ r 9 t pa / 60 33 1 PP 68 64 / p> p \ pb 59 32 I