164 GREXAT BRUN. 



Grenat Bkun, &c., Haiiy. Common 

 Garnet. 



Grenat Manganese, Brochant. See 

 Manganesian Garnet. 



Grenat Melanite, Brochant. See Me- 



LANITE. 



Grenat Noble, Brochant. See Alman- 

 DiNE, Precious Garnet. 

 Grenat Noir, Ha'dy. See Melanite. 

 Grenat Eesinite, Haiiy. See Colopho- 

 nite. 



Grenat Rouge de Feu Granuli- 

 forme, Haiiy. See Pyrope. 



Grenat du Vesuve, Dufrenoy. See 

 Leu cite. 



Grenatite, Jameson. A name given to 

 Stauroticle, in allusion to its (occasional) 

 garnet colour. 



Grengesite, Hiswger. A dark green 

 variety of Delessite, occurring in hemi- 

 spherical masses, with a radiated structure. 

 Streak greyish-gi-een. H. 2. S.G. 3"1. 

 Analysis, by Hisinger : 



Silica 27-01 



Alumina . . . . M'ol 

 Peroxide of manganese . 2-18 

 Protoxide of iron . . . 25 "63 

 Magnesia . . . .14-31 

 Water ..... 12-53 





HEDRITE. 



95-97 

 Name. After the locality where it ii 



found, Grengesberg, in Dalecarlia. 



Grey Antimony, Jameson. SeeSTiBNiTE 

 Grey Cobalt, Allan, See Smaltike, 

 Grey Copper, PhilUps. \ See 



Grey' Copper-ore, Jameson, > Tetra 



Kirwan. 



Grey Manganese, Allan.') 

 Grey Manganese -ore, I 



Jameson. \ o 



Grey Ore of Manganese, } manganite 



Kirwan. 



Grey' Oxide of Man 



GANESE, Phillips. 



Grey Silver Ore, Jameson. See Sel- 



BITE. 



Grinding Spar. A name applied in 

 Madras to Corundum, 



jG-ROPPiTE, Svanberg. A mineral sug- 

 gested by L. Ssemann to be altered Parga- 

 site. Colour rose-red to brownish red. 

 Translixcent in thin splinters. Streak paler 

 than the mineral. Fracture splintery. H.2-5. 

 S.G. 2-73. 



Comp. R5 Si2 + 2A1 Si + 3H (Svanberg)*, 



or K2 fsi + '4i '^i + 2H (Rammelsberg). 



* See Ottrelite. 



GROSSULAR, 

 Analysis, by Svanberg ; 



Silica 45-01 



Alumina .... 22-55 

 Peroxide of iron . , . 3-06 



Lime 4-55 



]\[agnesia .... 12-28 



Potash 5-23 



Soda 0-22 



Water 7-11 



Undissolved . . , ,0-13 



100-13 

 BB becomes white, and on thin edges 

 shows only incipient fusion. 



Dissolves in borax, with intumescence. 

 Locality. In limestone, at Gropptorp, in 

 Sweden, whence the name Groppite. 



Groroilite, Berthier. A variety of Wad, 

 occurring in roundish masses, of a brownish- 

 black colour, and with a reddish-brown 

 streak. H. sometimes 6 to G'o. 

 Analysis, by Berthier : 



Protoxide of manganese . 62*4 

 Oxygen ..... 12-8 

 Peroxide of iron . . .6-0 



Water 15-8 



Clay 3-0 



100-0 

 Localities. Yicdessos and Cautern, in 

 France. 



Name. After a locality in Groroi, in 

 Ma3'enne. 



Grossular, Phillips ; Gnossuf arite. A 

 variety of calcareous Alumina-Garnet. Co- 

 lour pale olive-green or greenish - white. 

 Translucent. Brilliant. Hard. Fracture con- 

 choidal, with a vitreous lustre. S.G. 3-42. 



Comp. Ca^ Si + Al Si. 



Analysis, from the Sludianka River, by 

 N. V. Iwanow : 



Silica 49-99 



Alumina .... 14-90 

 Peroxide of iron . . . 10-94 

 Protoxide of manganese . trace 

 Lime ..... 32-94 

 Magnesia . . . .0-98 



100-15 

 BB like Almandine, but affords a brown- 

 ish-coloured glass. 



Localities. Kear the river Wilui, in Si- 

 beria, in a greenish-coloured serpentinous 

 rock. (See Wiluite.) Tellemark, in Norway. 

 Name. From grossula (a gooseberry), in 

 allusion to its colour, which is similar to 

 that of a green gooseberry. 



