AMPELITIS. 



dorffite, occurring in small octahedrons of a 

 pale steel-grey colour at Lichtenberg in the 

 Fitchtelbirge. H. 4. S.G. 6-U8. 

 Analysis by Von Kobell : 

 Arsenic .... 45*34 



Nickel 37-34 



Sulphur .... 14-00 



Iron 2-50 



Lead 0-82 



Cobalt trace 



100-00 



Ampelitis, Dwscorides. Cannel Coal. 



AsiPHiBOLE, Haiiy. See Hornblende. 

 The name is derived from a/MpiSoXo;, ambigu- 

 ous ; because it had been confounded Avith 

 Tourmaline. 



Amphibole BLANC, Ha'dy.^ See TPvEmo- 



LITE. 



Amphigene, Haiiy, (from ct.!J.q,], double, 

 and yivo;, origin.') See Leucite. 

 Amphilogite. See Didrijiite. 

 Amphodeute, Nordenskiold, Phillips. A 

 reddish-grey or dingy peach-blossom-red 

 variety of Anorthite, occurring both crystal - 

 ized and massive at Lojo in Finland and at 

 Funaberg in Sweden. It resembles Felspar 

 Ti crystalline form, and Scapolite in fracture, 

 a. 4-5. S.G. 2-763. 

 Analysis by Nordenskiold, from Finland : 



Silica 45-80 



Alumina . . . . 35'45 



Lime 1015 



Magnesia . . . .5-05 

 Protoxide of iron . . 1-70 

 Water 1"85 



100.00 



Name. From a/t*?*', both, and e'SeXo?, a spit 

 or pointed pillar. 



Brit. Mus., Case 31. 



Anagenite. See Chrome Ochre. 



Analcime, Haiiy, Dana, Nicol, Phillips. 



Cubical. Primary form a cube. Oc- 

 curs generally in icositetrahedral (or 24- 

 sided) crystals. 



Colourless and transparent; or -white, 

 grey, red and opaque. Lustre shining, be- 

 tween pearly and vitreous. Streak wdiite. 

 Brittle. Fracture imperfect conchoidal. Be- 

 comes feebly electric by friction. H. 5 to 

 5-5. S.G. 2-068 to 2'2. 



Fig. 13. 



ANATASE. 



15 



Comp. Na3 Si + 3AI Si2 + 6H = silica 54-6, 

 alumina 23-2, soda 14-0, water 8-1=^100. 



Analysis hyConnel, from Old Kirkpatrick : 



Silica 55-07 



Alumina .... 22-23 

 Soda .... 13-71 

 Water 8-22 



99-28 



BB loses water and becomes milk-white ; 

 but when the heat is increased it again be- 

 comes clear, and then fuses quietly to a 

 transparent glass. Eeadily decomposed by 

 muriatic acid, with separation of viscid sili- 

 ca ; after ignition the decomposition is effect- 

 ed with more difficulty than before. 



Analcime usually occurs in the cavities of 

 amygdaloidal_ rocks, and is common in the 

 trap rocks of Ireland and Scotland. 



Localities. — Scotch. Dumbartonshire ; 

 Bowling and Long Craig, above Old Kirk- 

 patrick ; Salisbury Craig, Calton Hill, Ra- 

 tho quarry, Edinburghshire; Elie, Fife- 

 shire ; Campsie Hills, Stirlirigshire ; Can- 

 na, Eig, Mull and Staffa ; Waas in Hoy, 

 Orkney. — Irish. Giant's Causeway, in 

 small transparent crystals ; O'Hara's Rocks, 

 near Port Stewart ; Gweedore, Donegal, in do- 

 lomite ; Craignashoke,Derry. — Foreign. The 

 most perfectly pellucid crystals are found in 

 the dolerite of the Cyclopean Isles, near Cata- 

 nia, in Sicily ; also from the Seisser Alpe and 

 Fassa in the Tyrol. It is also found in the 

 Faroe Isles, Iceland, the Vicentine, Arendal 

 in Norw^ay, Andreasberg in the Harz, Nova 

 Scotia, &c. 



Name. From avuXxi;, weak ; in allusion to 

 its weak electric power, when heated or 

 rubbed. 



Brit. Mus., Case 29. 



M.P.G. Horse-shoe Case, Nos. 1175, 

 1176. Upper Gallery, Table-case A in re- 

 cess 4, No. 130. 



Analcime carnea, the name given by 

 Monticelli to Sarcolite, from its flesh-red 

 colour. 



Analzoi, Haidinger. See Analcime. 



Anatase. Dana, Haiiy, Greg §■ Lett- 

 som, Nicol, Phillips. Pyramidal ; primary 

 form an octahedron witli a square base. Oc- 

 curs in small octahedral crystals of various 

 shades of brown, passing into indigo-blue, 

 ■which appear greenish-yellow by trans- 

 mitted light. Semi-transparent to opaque. 

 Lustre splendent and adamantine. Struc- 

 ture lamellar. Streak white. Brittle. Frac- 

 ture sub-conchoidal. Becomes negatively 

 electric by friction. Exhibits a reddish- 



