PHYSIOGRAPHY. 



Tin-Ore. 



233 



It was found in sienite, in the isle of L6v-6n, near Brevig in Norway ; 

 but is now no longer to be obtained. 



THRAULITE. (See Hisingerite.) 

 THULITE. 



Cleavage, parallel to the sides of a rhombic prism, of 92o 30'. 



Color rose-red. Streak greyish white. 



Scratched by Quartz, and yielding to the knife with difficulty. 



1. It occurs at Tellemarken in Norway with Quartz, Fluor and Ido- 

 crase. 



THURINGITE. 



Massive : composition lamellar, and granular. 



Cleavage, in one direction perfect. 



Lustre pearly. Color olive-green. Streak siskin-green, and 

 shining with a resinous lustre. 



Greasy to the feel. Hardness (scale of BREITHAUPT) =2-5 

 ...3-0. Sp. gr. = 3-151 . ..3-157. 

 1. Found at Schmiedefeld in Saalfeld. 



TILE-ORE. (See Red Copper-Ore.) 



TINDER-ORE. (See Red Antimony.) 

 TIN-ORE. Peritomous Baryte-Ore. 



Primary form. Octahedron with a square base. P on 

 P"=67 50'. P on P'=133 30'. 



Secondary forms. 



Fig. 435. Fig. 436. 



Cornwall. 



Goshen, (Mass.) 



