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390 SILICATES. a h C d e f Silica 46-10 46-22 46-36 47 - 19 36 - 54 Alumina . . . Red ox. iron . . . 37-20 31-60 34-62 36-80 33-80 26-47 3-20 8'65 6-04 4-63 4‘47 27'06 Oxide of mangan. Lime .... Potash . . . Water . . . Hydrofluoric acid 0'90 1-40 2-11 2-68 1-92 9'60 8-39 8-22 9-22 0'13 8-35 0-93 6-47 2’63 0’56 l'OO 1-12 0-98 1-09 1-84 0'71 4-07 0-29 2-70 Analyses of mica g from Broddbo, h from Abborforss, both by Svanberg, i from Jefferson County in New York by Meit- zendorff, k from Siberia by Klaproth, I green mica from Schwarzenstein m the Zillerthal (fuchsite), m chrome-mica from Schwarzenstein, both by Schafhautl Silica . . , Alumina . , Red ox. iron Oxide of mangan. Protox. iron Magnesia Lime . . Potash . Water Fluorine . Aluminium Calcium . 9 h i k 1 711 47-97 39-46 41-30 48-00 47-95 47-68 31-69 9-27 1535 34-25 34‘45 15-15 6-37 35-78 1-77 450 1-80 5-72 1'67 (Mn 2-67) — 0-50 — 1-17 — 1-45 ox. chrome 3-95 6-91 — 3-29 28'79 — 0'72 11-68 — 0-31 — (soda 0-37 1-17) 8-31 6'06 9'70 8-75 10-76 7-27 3-32 — 0-28 1-25 — 2'86 0-72 0-29 330 — 0-36 0-35 Na,Ll 0-65 — _ — 0-32 — — 0-42 — Analyses of mica n, silver-white, locality unknown, g = 2'83l, by Rammelsberg, o from Zsidovacz, g = 2 817, by Kussin, V trom Vesuvius m oblique crystals, blackish-green, by Chodnew, q trom the Zillerthal by Varrentrapp, r from St. Etienne 817) by Delesse, s of six-sided prismatic crystals, re sembling mica, formed in the slags of a copper furnaco at Grarpenberg, by Mitscherlich Silica . . Alumina Red ox. iron Ox. mang. Magnesia Lime n 0 P 2 r 8 47-84 48-07 40-91 39-85 46-23 47-31 32-38 38-41 17-79 16-07 33 03 6-74 306 — 11-02 13-21 3-48 2891 — — — — trace 0-48 1-28 — 19-04 15-60 2-10 10-17 0-29 — 0-30 0-42 — C'23
