THRAULITE. 



BB becomes of a reddish-brown colour, 

 without fusing; with borax forms a glass 

 coloured by iron. 



Decomposed by muriatic acid, with forma- 

 tion of a jelly. 



Locality. Lovon, near Brevig, in Norway, 

 in syenite on compact Analcime. 



Brit. Mus., Case 26. 



The metal Thorium was first discovered 

 in this mineral by Berzelius. See also 

 Orangite. 



Thkaulite,u. Kohell. (From OpocvXi;, easily 

 frangible). A variety of Hisingerite, oc- 

 curring with Magnetic Pyrites at Bodenmais, 

 in Bavaria. 



Analysis, by v. Kobell ; 



Peroxide of iron . . . 50-86 



Silica 31-28 



Water 19-12 



101-26 

 Thrombolite, Dana, Breithaupt, Nicol. 

 Amorphous. Colour 3'ellowish-green, in- 

 clining to emerald-, leek-, or dark-green ; 

 becoming black on exposure to the air. 

 Opaque. Lustre vitreous. Rather brittle. 

 Fracture conch oidal. H. 3 to 4. S.G. 3-38 

 to 3-4. 



Comp. Phosphate of copper, or Cu^P + 



6H. 



Analysis, by Plattner : 



Phosphoric acid . . . 41*0 

 Silica, alumina . . . trace 

 Oxide of copper . . . 39-2 

 Water 16-8 



97-0 

 BB colours the flame blue and then green ; 

 on charcoal fuses i-eadily to a black globule, 

 and finally yields a globule of metallic 

 copper. 



Locality. Rezbanya, in Hungary, with 

 Malachite on limestone. 



Name. From 6so/:/,So;, numb or stiff, and 

 }Jdo;, stone. 



Thulite, Brooke. Occurs in translucent, 

 rose coloured, or peachblossom-red crystal- 

 line masses, or in small crystals more or 

 less imperfect ; with a composition analogous 

 to that of Epidote, except that they con- 

 tain a small per centage of protoxide of iron. 

 Lustre vitreous. Streak greyish - Avhite. 

 H. 6-5. S.G. 3 1 to 3-4. 



Analysis, from Souland, by C. Gmelin : 



Silica 4-2-81 



Alumina .... 31'] 4 

 Protoxide of iron . . 2-29 

 Lime 18-73 



TILE-ORE. 379 



Magnesia . . . .1*63 



Soda 1'89 



Water 0-64 



99-13 



BB froths, swells up to a white porous 

 mass and fuses at the edges only. 



Localities. Norwaj' ; at Souland, in Telle - 

 marken, associated with Quartz, Fluor, and 

 Cyprine ; and at the iron mine, near Klode- 

 berg. 



Name. From Thule, another name for 

 Norway. 



Thulite, instead of being classed with 

 Epidote (as it was by Brooke), ought (ac- 

 cording to Descloizeaux), on account of its 

 optical!}'- biaxial properties, to be referred 

 to a right prism, the angles and cleavage of 

 which have nothing in common with those 

 of Epidote. 



Thumersteix, Werner, "i A name given 



Thumerstone, Jameson, >to Axinite, af- 

 Kirwan. j ter that of the 



place in Saxony (Thum) where it was first 

 found. 



Thuringite, Breithaupt, Dana. Massive, 

 consisting of an aggregation of minute scales. 

 Cleavage in one direction. Colour olive- 

 green. Lustre pearly. Streak paler than 

 the colour. Feel of powder greasy. Gives 

 off" an argillaceous odour. Ver}' tough. 

 Fracture subconchoidal. H. 2 to 2-5. S.G. 

 3-151 to 3-197. 



Comp. FeS'si + fe(Si Al) + 3H. 

 Analysis, by Smith : 



Silica 22-05 



Alumina .... 16-40 



Peroxide of iron . . . 17-66 



Protoxide of iron . . 30*78 



Protoxide of manganese . 0-89 



Potash and soda . . . 0-14 



Water 11*44 



99-36 



BB fuses easily to an iron-black globule ; 

 with borax affords an iron reaction. 



Dissolves easily in dilute muriatic acid. 



Localities. Schmiedfeld, near Saalfeld, in 

 Thuringia, whence the name Thuringite. 

 Near Harper's Ferry, on the Potomac, U. S., 

 in metamorphic rocks. 



TiEMANNiT, Kenngott. A name given to 

 Onofrite (which see), in honour of the dis- 

 coverer, Tiemann. 



TiLE-ORE, Jameson, Kirwan. A name 

 applied to the earthy varieties of Red Copper 

 from its colour, which is usually brick-red, 

 or reddish-browm. It consists of Red Oxide 

 of Copper, mixed with variable proportions 



