IDRIALINE CINNABAR. 



silver mines of Iclria in Carniola. It occurs 

 massive, of a greyish or brownish- black co- 

 lour, with a greasy lustre. Opaque. Streak 

 blackish inclining to red ; shining. Unc- 

 tuous. Sectile. H. 1 to 1-5. S.G. 1-4 to i-6. 

 Comp. C42 H14 + O. 



Annlysis, by Budecker : 



Carbon .... 91-828 

 Hydrogen . . . .5-299 

 Oxygen .... 2-873 



100-000 



Brit. Mus., Case 60. 



Idriai.ine Cinnabar, A compact and 

 slaty mixture of Cinnabar with Idrialite and 

 earthy particles. From the quicksilver mines 

 of Idria in Carniola. 



Brit. Mus., Case 9. 



Iglesiasite. See Cerusite. 



Iglite, Igloite. a variety of Aragonite 

 from Iglo in Hungary. 



Ildefonsite, Haidinger. A variety'- of 

 Columbite from Ildefonso in Spain, with a 

 submetallic vitreo-adamantine lustre. S.G. 

 7'41fi. 



Illijderite, Karsten. See Zoisite. 



Ilmenite, Brooke. The Mengite of G. 

 Eose. 



Ilmenite, Kupffer. A variety of Titani- 

 ferous Iron, generally occurring massive, 

 but sometimes in opaque crystals of a dark 

 iron-black colour. Primary form an acute 

 rhombohedron. Lustre sub-metallic. Slightly 

 magnetic. Streak black. Fracture conchoi - 

 dal. H. 6. S.G. 4-895. 



Comp. Titanate of iron, or Fe Ti + ¥e, in 

 variable proportions. 



Analysis, by Mosander, from the Ilraenge- 

 birg: 



Titanic acid . . . 46-92 



Protoxide of manganese . 2-73 



Magnesia . . . .1-14 



Protoxide of iron . . . 37-86 



Peroxide of iron . . . 10-74 



99-39 

 BB alone infusible ; with fluxes behaves 

 like oxide of iron. 



Soluble in concentrated muriatic acid 

 when finely pulverised. 



Localities. — British. In crystalline lamel- 

 lar masses at Glen Finnart, in Argyleshire, 

 with Chlorite, in mica- slate. Ben Ima, and 

 HillswicknedS in Shetland —Foreign. Crjs- 



INDIANITE. 189 



tallized_ and massive at Lake llmen, near 

 Miask, in Siberia. Krageroe, Arendal, &c. : 

 in Norwa}', 



Name. After the locality, llmen. 



Brit. Mus., Case 37. 



Ilmenorutile, Von Kokscharow. A va- 

 riety of Rutile occurring in the form of the 

 fundamental pyramid, without any pris- 

 matic planes. It is iron-black and opaque, 

 or in small crystals slightly red at the 

 edges when held between the &jq and the 

 sun. H. above 6. S.G. 5-074 to 5-133. 



Comp. According to R. Hermann : Ti- 

 tanic acid 89-3, peroxide of iron 10-7 = 100. 



Locality. The Phenacite and Topaz mine 

 of the llmen mountains. 



Ilvaite. a name for Lievrite, after that 

 of the Island of Elba, where it was first 

 found. 



brpERFECT Corundum, Greville §■ Bour- 

 non. See Corundum. 



Ii\iPURE Topaz, Kirionn. See Citrine. 



Indian Red, T. H. Rowmy. A kind of 

 Ochre, imported from the Persian Gulf in 

 small lumps, and partly as a coarse, hard, 

 and gritty powder. Colour deep red with 

 a shade of purple, S.G. 3-843. 



Comp. Silicate of iron, or F-e Si. 



Analysis, by T. H. Rowmy : 



Silica 30-17 



Peroxide of iron . . . 56-59 

 Alumina .... 3-79 

 Lime . . . . . 2-65 

 Magnesia . , . .1-43 

 Sulphuric acid . . . 2 28 

 Carbonic acid . . .1-73 

 Water . . . ... 1-62 



100-26 



BB alone infusible, and, after cooling, is 

 attracted by the magnet. On platinum wire, 

 Avitli borax and microcosmic salt, yields a 

 transparent globule, with the usual reaction 

 for iron. 



By digestion with concentrated muriatic 

 acid, a small portion is dissolved, and the 

 remainder ret<ains its red colour, and is not 

 further altered by continued application of 

 heat. 



Indian Red is the crude material which 

 furnishes the well-known pigment of that 

 name. 



Indian Topaz. A name given by lapi- 

 daries to saffron -yellow Topaz. 



Indi\nite, Bournon. A variety of Anor- 

 thite, occurring in masses which have a 

 granular texture somewhat resembling that 

 of statuary marble, and a glistening surface 



