148 GALENA DE BISMUTH. 



to 33, and 43 to 45 (British) ; 41 (Newfound- 

 and); 21 (Foreii^n). 

 Galena de Bismuth, Brochant. See Bis- 



MU THINE. 



Gallicinite ; Gallitzenstein. Eutile. 

 See Gai.ltzinite, 



Gallitzinite, Leymerie ; Gallizen- 

 stetn; Gallizinite, Beudant. See Gos- 

 T.AKiTE, or Sulphate of Zinc. Named 

 after Prince Galiitzin. 



Gallizinite. A variety of Nigrine from 

 Spessart, near Aschaffenburg in Franconia. 



Anahjsis, hj Klaproth : 



Oxide of titanium . . .22' 

 Oxide of iron . . . .78 



100 



Galmei, Hausmann. See Calamine. 



Galmei, Naumann. See Smithsonite. 



Galmey, Werner. Eefers both to Cala- 

 mine and Smithsonite, or to the Carbonate 

 and the siliceous oxide of Zinc. 



Ganomatite ; Ganse- Kothig-erz. From 

 ycc'jog, brightness. See Chenocoprolite. 



Garbenstilbit. See Stilbite. 



Garnet. Cubical. Occurs in rhombic 

 dodecahedrons and icositetrahedrons ; also 

 massive, granular, and lamellar. Cleavage 

 dodecahedral ; sometimes distinct. Lustre 

 vitreous, inclining to resinous. Colour black, 

 red, brown, yellow, green, white. Trans- 

 parent to opaque. Streak white-grey. Frac- 

 ture subconchoidal, uneven. H. 6-5 to 7-5. 

 S.G. 3-1 to 4-3. 



Comp. A silicate of different bases, repre- 



Fig. 206. 



Fig. 207. 



sented by the formula R'^ Si + S Si=(K3 + 

 ii) tSi, where R maybe lime, magnesia, oxide 



of iron, and ic is alumina. 



Garnet has been divided into six sub- 

 species, viz. : — 



L Alumina-lime Garnet, consisting of sili- 

 cates of alumina and lime. 



II. Alumina-magnesia Garnet, consisting 

 of silicates of alumina and magnesia. 



III. Alumina-iron Garnet, consisting of 

 silicates of alumina and iron. 



IV. Alumina-manganese Garnet, consist- 

 ing of silicates of alumina and manganese. 



GARNET. 



V. Iron-lime Garnet, consisting of sili- 

 cates of iron and lime. 



VI. Lime-chrome Garnet, containing lime 

 and oxide of Chromium. 



I. Lime-garnet or Grossular, consists of 



Ca3 Si + Al Si = (Ca3 + Al) Si = silica 40'1, 

 alumina 227, lime 37-2 = 100-0, 



Colour pale greenish, clear red, and red- 

 dish orange ; also cinnamon colour. H. 6*5 

 to 7. S.G. 8-43 to 3-73. 



BB fuses to a slightly greenish glass or 

 enamel. 



Soluble, when powdered, in concentrated 

 muriatic acid. 



This section comprises Cinnamon -stone 

 or Essonite, Grossular or Wiluite, Roman- 

 zovite, Topazolite, and Succinite. 



I I. Magnesia -garnet. 



Comp. (Mg Fe3) Si + Al Si = (Mg Fe^ + 



Al) Si. 



Colour deep coal-black. Lustre slightly 

 resinous. H. 6*5 to 7. S.G. 3-157. 



BB easily fusible, forming, with intumes- 

 cence a dark greyish -green globule, which 

 is non-magnetic. 



III. Iron-garnet. 



Comp. Fe3Si+Ai Si = (Fe5 + A:i) Si = 

 silica 36-3, alumina 20*5, protoxide of iron 

 43-2 = 100. 



S.G. 3-7 to 4-21. 



BB fuses rather easily, with an iron re- 

 action. 



This section comprises AUochroite, Al- 

 mandine or Precious Garnet, and Common 

 Garnet. 



IV. Manganese-garnet or Spessartine. 



Comp. (Mn3+Al)Si. 

 Colour brownish-red. H. 7 to 7'5. S.G. 

 3-7 to 4-2. 



BB gives a manganese reaction. 

 See Spessartine. 



V. Iron-lime Garnet. 



Ca3 Si +F^e Si = (Ca3 +?e) Si. 



Colour dark red, brownish -black, black. 

 Lustre dull or shining, sometimes resinous 

 (Colophonite). H. 7. S.G. 3-6 to 4-0. 



This section includes Aplome (S.G. 3*45 

 to 3-85), Colophonite (S.G. 3-8y6), Melanite, 

 and Pyreneite. 



VL Lime-chrome Garnet or Ouvarovite. 



Colour emerald -green. 



Comp. Ca.^ Si + (-^r, Al) Si = (Ca^ + H&r 



