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372 SILICATES. Silica . . . . Alumina . . . Red oxide of iron Lime . . . Magnesia . . Soda . . . Potash . . . "Water . . . n 0 P 1 r 67’62 67-20 66-80 66-11 67-39 16'69 19-64 21-80 18-96 19-24 2-30 — 0-30 0-34 — 0-85 1-44 2-62 3-72 0-31 1-46 0-31 0-20 0-16 0-61 10-24 9-91 7-00 9-24 623 0-51 1-57 0-68 0-57 6-77 069 — 0-60 — — and cleavable le, lava. or granular masses, in Is found at Auris in Dauphine and Montagne de Lis near Bareges in the Pyrenees, Baveno in Italy on felspar, Bobritzsch near Freiberg, Borstendorf, Siebenlehn, Penig and Zoblitz in Saxony, Langenbielau and near Hirschberg in Silesia, Gastein and Hiittemyinkel in Salzburg, Andreasberg and Steinberg near Goslar in the Harz, on the Rohrberg and Greiner, the Schmunerthal, Pfundersthal and Pfitscheijoch in the Tyrol, Rozena and near Bobruwka in Moravia, Wittichen in Baden, Greenland, Kerabinsk near Miask and Alabaschka near Mur- sinsk in Siberia, the Saualpe in Carinthia, St. Gottbardt and other places in the Alps, Kimito in Finland, Broddbo and Finbo in Sweden, Tintagel in Cornwall, in syenite and green stone near Edinburgh, the Mome mountains in Ireland, Upper Egypt, Chesterfield and Wilmington in Massachusetts, Almada m the Brazils. 211. OLIGOCLASE.—Oligoclase; Dufrenoy. Antitomer Feld-Spath; Mobs. Oligoklas; Hausmann, Haidinger. Anorthic. 010, p ooi, e 021, n 021, x 101, y 201, I 110, t 110, z 130, f 330, 8 111, 0 111, u 221. The face n truncates the edge pm. FIG. 388. mp 86° 46' pt 64 30 It 60 nearly. Combinations, xpenzfm, xposeyutlzfrn. Twins. 1. Twin axis the axis of the zone xp. 2. Twin-fece m. The massive varieties are frequently composed of numerous pairs of twins
