350 Mr. William Phillips 07i the OxydofTm. 



Incidence of 5 on 4 fig. 49 - - - - - 153°. 25' 



. 5 on 5 over the plane 4 fig. 49 - - - 126^. 45' 



. . 5 on 5 over the plane 1 fig. 49 - - - 143". 10' 



. 6 on 1 fig. 60. PI. 18 ... . 168°. 40' 



6 on 5 fig. 60 - - - - - 172". 50' 



7 on 1 fis. 66 - - - - - 155^ 25' 



^ 7 on 2 fig. 70 - - - - - 154°. 15 



— 7 on 7' fig. 66 - - - - " 1^^°- ^' 



— 7'on7'fig. 66 . - - - - 118". 10' 



— 9 on 1 fig. 114 PI. 20 . - , , 157°. ? 



— 9 on 2 fig. 114 - - - - - 131°. 10- ? 

 —10 on 2 fig. 164 PI. 22 - - - - 150°. 30' ? 

 —10 on 9 fig. 167 .... - 158°. 15' 



Specific Characters . 



Primitive crystal — an octohedron composed of two obtuse quadran- 

 gular pyramids joined at their bases, which are square. 



Fracture — mostly shattery, often vitreous ; sometimes conchoidal, 

 sometimes lamellar. 



Aspect — non metallic. 



Specific gravity* — 6,9009 — 6,9348 according to Haiiy. 

 of the crystallized grey tin-stone 6,84, Klaproth. 

 of stream tin - - _ _ _ Q^SQ^ ditto, 

 of another ditto - - - - 6,97, ditto, 

 of wood tin ______ 6,45, ditto. 



Hardness — brittle and easily frangible; gives sparks with a steel. 



* " It is remarkable enough that tin, which, in the metallic state, is one of the lightest 

 metals, surpasses in specific gravity, when in the state of oxyd, the greater part of other 

 substances of the same class, whether simple oxyds or composed of an oxyd with a 

 mineralizing substance. The weight of oxydated tin is such, that its diflference Avith that 

 of metallic tin is but about one-twentieth at least; whilst other metals offer, in analogi- 

 cal instances, differences which amount to one-half or one-third." Haiiy. 



