16 ANAUXITE. 



vellow phosphorescent light when heated. 

 H. 5-5 to 6. S.G. 3-83 to 3-95. 



Fig. 14. 



Fig. 15. 



Comp. Pure titanic acid or Ti = titanium 

 60-29, oxygen 39-71 = 100. 



BB alone infusible. With soda forms a 

 dull yellow globule, which* becomes white 

 on cooling. Dissolves in warm concen- 

 trated sulphuric acid. 



Localities.— English. Cornwall; at Looe 

 Mills Hill quarry, near Liskeard ; and at 

 Tintagel Cliffs. Devonshire; Virtuous Lady 

 mine, near Tavistock, ^p4 14. — Welsh. Tre- 

 madoc, Snowdon,^^. 15, with Brookite and 

 Cleavelandite. — Foreign. Bourg d'Oisans 

 in Dauphiny ; Brazil, in Quartz, and at 

 Minas Geraes, in detached crystals, which 

 are so splendent as to be sometimes mis- 

 taken for Diamonds. Tavatsch in the Tv- 

 rol. The Grisons in mica-slate. Slidrein 

 Norway. The Ural. Spain. 



Name. From avarccin?.! extension, in allusion 

 to the height of the pyramids of the octahe- 

 dral crystals. 



Brit. Mus., Case 37. 



AxAuxiTE, Breithaupt. Occurs massive 

 and granular. Colour greenish-white. 

 Translucent at the edges. Lustre pearly. 

 H. 2 to 3. S.G. 2-26. 



Comp. According to Plattner it is com- 

 posed of silica 55-7, with much alumina, a 

 little magnesia a»d protoxide of iron, and 

 11 '5 per cent, of water. 



BB becomes white and fuses at thin edges. 



Locality. Bilin in Bohemia. 



Name. From otvxllvtTo;, without augmenta- 

 tion. 



Andalusite, Phillips, Jameson, Dana, 

 Nicol, Haiiy. Rhombic. Occurs in slight- 

 Iv rhombic, four-sided prisms ; also massive, 

 when it is exceedingly tough. Structure 

 lamellar. Colour pearl-grey or flesh-red, 

 sometimes purplish red. Translucent at the 

 edges or opaque. Lustre vitreous, often 

 weak. Streak white. Tough. Fracture 

 uneven. H. 7'b. S.G. 3-1 to 3-2. 



Fig. 16. 



ANDESINE. 

 Comp. Anhydrous silicate of alumina or 



A14 si3 = alumina 59-7, silica 40-3 = 100. 

 Analysis by Hubert, from the Tyrol : 

 Alumina . . . . *59 49 



Silica 39.24 



Peroxide of iron . . . 0-63 . 

 Magnesia . . . .0-25 

 Lime 0-51 



100.12 



S-S infusible alone: with borax fuses with 

 difficulty, when reduced to powder, to a 

 transparent colourless glass ; and with still 

 greater difficulty and less perfectly in mi- 

 crocosmic salt. With soda swells up, but 

 does not fuse. Insoluble in acids. 



Localities. — Scotch. Auchindoir, Aber- 

 deenshire; Bt)triphny, Banffshire; Unst, 

 Shetlands. — Irish. Scalp mountain, Done- 

 gal ; Douce mountain, co. Wicklow ; also at 

 Lugganure, Glendalough and Glen Malure. — 

 Foreign. Lisenz valley abovelnnspruck.in the 

 Tyrol, in very large crystals. Near Brauns- 

 dorf in Saxony ; Guldenstein, in Moravia ; 

 Bavaria ; Siberia. 



Andalusite occurs in crystalline schists, 

 principally in gneiss, in mica and clay-slate. 

 It may be distinguished from Felspar by its 

 greater hardness and infusibility ; from Co- 

 rundum by its structure and lower specific 

 gravity. 



Name. It is named after the province of 

 Andalusia, in Spain, where it was first ob- 

 served. See Chiastolitb. 



Brit. Mus., Case 26. 



Andesine, Dana. Anorthic. Eesembles 

 Albite. Colour white, grey, greenish, yel- 

 lowish, flesh -red. Lustre sub vitreous, in- 

 clining to pearly. H. 6. S.G. 2-65 to 2-74. 



Comp. K3 Si + 3Ai Si or (K, Na, Ca, Mg)3 



Si -1- 3AI Si2. 

 Analysis by Ahich, from Marmato : 



Silica 59-60 



Alumina .... 24-18 

 Peroxide of iron . . . 1-58 



Lime 5-77 



Magnesia . . . .1-08 



Potash 1-08 



Soda 6-53 



99-82 

 BB fuses much more readily than Albite, 

 and yields a turbid glass. Imperfectly so- 

 luble in acids. 



Localities. Andesine is one of the com- 

 ponents of the rock Andesite, which occurs 

 jn the Andes (hence the names Andesine 



