682 APPENDIX. silky. Yellowish-green, greenish-grey. Brittle. Single fibres slightly flexible, h = 2*5. G = 2-6. Taste sour and astringent. Analyses of stypticite a from Copiapo by H. Bose, b fibroferrite from Chile by Prideaux:— a I Sulphuric acid . . . . 31*73 28*9 Bed oxide of iron . . . 28*11 34*4 Lime 1*91 — Magnesia — Water 36*56 36*7 Is found with coquimbite in the district of Copiapo in the province of Coquimbo in Chile. TALKAPATIT.—G = 2*70...2*76. Soluble in nitric acid. Analysis by Hermann:—phosphoric acid 39'02, lime 37*50, mag nesia 7*74, chlorine 0'9l, sulphuric acid 2*10, oxide of iron roo, fluorine and loss 2*23, insoluble 9*50. Is found near Kusiusk in the Ural. TECTICITE.—Prismatic. Cleavage single, imperfect. Frac ture conchoidal. Transparent... translucent. Lustre vitreous... resinous. Clove-brown. Streak white, h = 1*5...2*0. g = 2*o. Taste vitriolic. Deliquescent. In small prismatic crystals and massive. Is produced by the decomposition of pyrites. Is found at Stamm Asser at Q-raul near Schwarzenberg, Neue Hoffnung Gottes at Braunsdorf in the Erzgebirge. VANADIATES OF LEAD.—Analyses of minerals con sisting principally of vanadiate of oxide of lead. From an un known locality by Damour:—vanadic acid 15*86, chlorine 2*26, oxide of lead 63*73, lead 6*62, oxide of zinc 6*35, oxide of copper 2*96, water 3'80. Supposed to be from Wicklow by B. D. Thomson:—vanadic acid 23*44, chlorine 2 - 45, oxide of lead 60*33, lead 7*06, oxide of iron and silica 0*16. From Mina Grande in Chile by Domeyko:—vanadic acid 15'21, arsenic acid 5'26, phos phoric acid 0*72, oxide of lead 60*66, oxide of copper 17*88, chlo ride of lead 0*37. VANADIATE OF LEAD AND COPPEK OXIDES from Chile. Analyses by Domeyko :— Vanadic acid .... 13*6 13*33 Arsenic acid 4*8 4*68 Phosphoric acid ... 0*6 0*68 Oxide of lead .... 64*9 61*97 Oxide of copper . . . 14*6 16*97 Chloride of lead ... 0*3 0*37