S4 AXINITE. 



Comp. R5 (si, "ii)2 + 2ii(si, ii) Ram- 



melsberg §• Rose : or (Ca Mg Mn Fe) Si^ + 



2(¥e Ai) si + 2 CaB. Z. GmeZm. 

 Analysis from Dauphiny, by Rammelsherg : 

 Silica . . . ' . . 43-68 

 Boracic acid . . . 5'61 



Alumina .... 15-63 

 Peroxide of iron . . . 9-45 

 Peroxide of manganese . 3 05 



Lime 20-67 



Magnesia . . . .1-70 

 Potash .... 0-64 



100-43 



BB melts easily, with intumescence, to a 

 greenish-white semitransparent glass, which 

 becomes black in the outer flame, in con- 

 sequence of the manganese passing to a 

 higher degree of oxidation. With borax 

 dissolves readily, yielding an iron-coloured 

 glass, which assumes a violet tint after long 

 heating in the outer flame. 



Not acted on by acid, except after fusion, 

 and pulverisation, when it is completely 

 dissolved in muriatic acid, with the forma- 

 tion of a jelly of silica. 



Localities. — English. In very perfect crys- 

 tals of a clove-brown colour (Jigs. 35 and 36) 

 in Cornwall, at Botallack and Trewellard, 

 near St. Just ; also lately at Lostwithiel and 

 St. Columb. Brent Tor, four miles north 

 of Tavistock in Devonshire. Pseudomor- 

 phous crystals of Chlorite, with the form of 

 the Crystals from St. Just, are found on 

 i^artmoor, — Foreign. Axinite was first found 

 at Thum, in Saxony, whence its name of 

 Thumite or Thumerstone ; it is also found 

 p.t St. Christophe, near Bourg d'Oisans in 

 Dauphine; near Bareges in the Pyrenees; 

 at Santa Maria in Switzerland ; at the 

 silver mines of Kongsberg in Norway, at 

 Arenclal ; in Savoy ; in the Harz ; Coquimbo 

 in Chili ; Cold Spring in New York, &:c. 



Name. The name is derived from «.^m, an 

 a.ve, in allusion to the form of the crystals, 

 which are sharp like the edge of an axe. 



M.P.G. Horse- shoe Case, No. 1010. 



Brit. Mus., (Jase 40. 



AxoTOMOus Arse- 



Kic Pyrites, Jameson. \ o y 



See Leucopyrite. 



'] 



Kohell See KiB- 



AxoTOMous Arse- 

 nical Pyrites, Mohs. 

 AxoTOMous Iron, 



DELOPHAME. 



AxoTOMOus Iron-ore, Mohs. See II 



MENITE. 



Azorite, Teschemacher, Dana. Pyra 



• BABINGTONITE. 



midal. Columbate of lime, occurring in mi- 

 nute square pyramids, somewhat shorter 

 proportionally than the regular octahedron. 

 Colourless, or white with a faint greenish- 

 yellow tinge. Translucent to opaque. Vi- 

 treous in fracture. H. 4.4 to 4-5 



BB infusible; smaller crystals become 

 opaque white, the larger become reddish in 

 the outer flame, and pale yellow in the inner. 



It is found in an albitic rock, associated 

 with black Tourmaline and Pyrrhite in the 

 Azores, whence the name Azorite. 



Azure Copper-ore, Jameson. Blue car- 

 bonate of copper ; See Chessylite. 



Azure-spar. Azurestone, Jameson. 

 Azurite, Phillips, Jameson. See Lazu- 

 LiTE. Beudant uses the term Azurite for 

 Blue Carbonate of Copper. See Chessy- 

 lite. 



B. 



Babel Quartz. A variety of Rock 

 Crystal. Instead of tapering gradually 



Fig. 37. 



towards their extremities, as is the case 

 with many ci-ystals of Quartz,these diminish 

 suddenly at intervals, and are built up as it 

 were of a series of short steps, which, from 

 their fanciful resemblance to the successive 

 storeys of the Tower of Babel, have caused 

 the name of Babel-Quartz to be given to 

 this variety. 



Locality. Tamar mines, Devonshire. 



M. P. G. Horse-shoe Case, No. 528. 



Babingtonite, Levy, Dana, Nicol, Phil- 

 lips. Anorthic. Colour dark greenish-black. 

 Lustre vitreous. Surface brilliant. Faintly 

 translucent in splinters : appearing greenish 

 parallel to the axis, and brown transversely 



Fig. 38. 



Fig. 39. 



to it. Fracture imperfect conchoidal. H. 5 -5. 

 to 6. S.G. 3-35 to 3-5. 



Comp. (Ca Fe)6 Si5. 

 Analysis from Arendal, bv Arppe : 

 . . ." . 54-4 



Silica 

 Lime 



19-6 



