494 LIST OF MINERALS, THEIR 



native plumbo-auriferous ; Blattererz ; foliated Tellu- 

 rium. A right square prism ; P on a plane belong- 

 ing to mod. class c, 110". 

 Tennantite, see Copper, sulphuret of Copper, Iron and 



Arsenic. 



Terra de Siena, see Bole. 

 Terra sigillata, see Bole. 

 Thallite, see Epidote. 



Tharandite, see Lime, carbonate, magnesian. 

 THOMSONITE. A right rectangular prism ; M on a plane 



belonging to class rf, 135 10'. 



THULITE. Cleavage parallel to the planes of a prism of 

 92 30', and 87 30', but not any distinct cleavage 

 transverse to the axis of this prism. 

 Thumerstone, see Axinite. 

 Thumite, see Axinite. 

 TIN. 



oxide, crystallised. An octahedron with a square base. 

 V on P, 133 30'; P on P", 67 52', as measured by 

 \V. P. 



compact. 



fibrous ; Wood tin. 



sulphuret of Tin and Copper ; Bell-metal ore. 

 Tinder-ore, see Antimony. 

 Tinkal, see Soda, borate. 



TITANIUM, is found pure, and crystallised in small copper- 

 coloured cubes, in the iron slag from Merthyr 

 Tydvill. Discovered by Dr. Wollaston. 

 oxide; Anatase; Octahedrite; Oisanite. An octahedron 

 with a square base, P on P', 98; P on P", 

 136 12'. 

 ..... .Rutile ; Crispite ; Gallizinite ; Saginite. A right 



square prism, with a cleavage parallel to its 

 diagonals and to its lateral planes. P on a 

 plane belonging to mod. class c, 132 32'. It 

 is from a very perfect crystal belonging to Mr. 

 Heuland, that I have been able to ascertain 

 this form. Hauy gives it as a rectangular 

 prism ; but the measurement of Mr. Heuland's 

 crystal, and the modifications it contain;;, 

 leave no doubt of its being what I have des- 

 cribed, 

 chromiferous. 



ferriferous ; Gregorlte ; Iserine j Menachanite ; 

 jVigrine. 



