

TIXKAL. 





Lead . 



. 



. 43-06 



Antimony 





. 16-88 



Arsenic 





. 12-60 



Iron 





. 4-52 



Silver . 





. 2-56 



Sulphur 





. 19-57 



TOPAZ. 



381 



98-29 



The principal localities are Andreasberg 

 and Clausthal, in the Harz. 



Brit. Mus., Case 38. 



TiNKAL, Hausmnnn. See BORAX. 



TiROLiTE, Haidinger, Nicol. 'See Tyeo- 

 LITE. 



Titan Schorl, Reiiss. See Rutile. 



TiTANATE OF IrON. See ILME^"ITE. 



TiTANATE OF LiME. See Perowskite. 



TiTANE Anatase, ?Tauy. See Anatase, 



TiTAXE OxYDE, Haiiy. See Rutile. 



TiTANE OxYDE Chkojiifere, Haiiy. A 

 variety of Rutile containing a small per- 

 centage of chrome, from Karingsbricka, in 

 Sweden. 



TiTANB SiLiCEO-CALCAiRE, Haiiy. See 

 Sphene. 



TiTAXEisEN, V. Leonhard. Titaniferous 

 Magnetite. 



TiTANEISEN, or TiTANEISENERZ, Nau- 



mann. See Ilmenite. 



Tit^v:s;eisenstein, Hausmann. See IsE- 



RINE. 



Titanic Acid, Thomson. See Rutile, 



Titanic Iron, Allan. See Ilmenite. 



Titaniferous Cerite, Laugier. A va- 

 riety of Cerite, of a blackish-brown colour 

 from the coast of Coromandel. 



Titaniferous Iron. See Ilmenite, and 

 [serine. 



Titaniferous Iron Sand, Breithaupt. 

 [serine occurring in octahedrons and cubes 

 in roundish grains. This kind of iron-sand 

 is very abundant in the tertiary, fine basaltic 

 md sedimentary formations of many locali- 

 ties in the colony of Victoria. A fine sand, 

 containing 88-45 of peroxide of iron, 11-43 

 Df oxide of titanium, with silica, and 12 per 

 :ent. of waste — is found in New Zealand, 

 along the shores of New Plymouth, in 

 faranaki. " This sand has the appearance 

 )f fine steel filings, and if a magnet be 

 Iropped upon it and taken up again, the 

 instrument will be found thickly coated 

 ivith the iron granules. The place where 

 :he sand abounds, is along the base of 

 Mount Egmont, an extinct volcano ; and 

 ;he deposit extends several miles along the 

 ioast to the depth of many feet, and having 

 I corresponding breadth. 



" The sand, as it is taken from the beach, 

 tias been found to produce sixty-one per 



cent, of iron of the very finest quality ; and 

 if the sand be subjected to the process of 

 cementation, the result is a tough steel, the 

 properties of w^hich seem to surpass any 

 other description of that metal at present 

 known." — {Australian Hail, quoted in The 

 Geologist, No. 40, April 1861, p. 162.) 

 TiTANiT, Beuss. "J 

 Titanite, Kirwan, V See Sphene. 

 Klaproth. J 



TizA. The name by which Borate of lime 

 (Hayesine) is called in Southern Peru, Avhere 

 it occurs on the dry plains in the neighbour- 

 hood of Iquique, in Avhite reniform masses, 

 varying in size from a hazel-nut to a 

 potato. 



Toad's-eye Tin. A light hair-brown 

 variety of Wood- tin. It is found in minute 

 spherical masses, with a fibrous structure 

 imbedded in a quartzose rock, in several 

 mines near Tregurthv Moor, in Cornwall. 



31. P. G. Principal Floor, Wall-case 28, 

 No. 198. 



ToLFA Diamonds. Colourless Rock 

 Crystals, found in a quartz-rock near Tolfa, 

 in the Papal States. 



31. F G. Upper Gallery, Table- case B, 

 in Recess 6. No. 171. 



To:\ibazite, Breithaupt. A variety of 

 Gersdortfite, occurring in bronze-yellow or 

 pinchbeck-brown cubes, with a hexahedral 

 cleavage, near Lobenstein, in Thuringia. 

 It contains nickel, arsenic, a little sulphur, 

 and traces of cobalt and iron (^Plattner). 

 H. 4 to 5. S.G. 6-637. 

 Brit. Mus., Case 6. 



ToJiosiTE, Dufrtnoy. An amorphous 

 compact silicate of manganese, from the 

 Harz. See Photozite and Diaphorite. 



Topaz. Is a fluo-silicate of alumina, or 

 a silicate of alumina with one-seventh of the 

 oxygen replaced by fluorine. Rhombic : 

 primary form aright rhombic prism. Cleav- 

 age perfect at right angles to the principal 

 axis. Colour white, yellow, blue, and green. 

 Lustre vitreous. Transparent to subtrans- 

 lucent. Streak white. Fracture uneven- con- 





(ff% 



Fig. 434, 



Fig. 435. 



choidal. Pyroelectric. Cuts Quartz, but is 

 cut by Ruby. H. 8. S.G. 3'4 to 3-6. 



