Tin, 
351 
Hard, 
Brittle. 
Easily frangible. 
Uncommonly heavy. 
Specific gravity, 5.800 Brumich ; 6.450 Klaproth « 
✓ 
Chemical Characters . 
Before the blow-pipe, it becomes brownish- black, but 
is infusible or irreducible, either alone or with borax. In 
a charcoal crucible, Klaproth obtained 0.6333 of tin. It 
is little affected by acids. 
Constituent Parts . 
Klaproth found it to contain in the hundred parts, 63 
parts of tin, with iron and arsenic. 
Geognostic and Geographic Situations . 
Has been hitherto found only in Cornwall, and there in 
alluvial land, accompanied with tinstone. 
Observations . 
It bears a strong resemblance to Brown Hematite ; 
from which, however, it is distinguished by its hair- 
brown colour, its rolled pieces, greater hardness, and high- 
er specific gravity. [ Jamesons Mineralogy . 
Ores of Tin. — — Aikin. 
The existence of native tin was long a matter of doubt 
| among mineralogists. It has, nevertheless, been undoubt- 
edly found in various places. Magellan, among other 
specimens, mentions, 1. Malleable tin in a granular form, 
and also foliaceous, bedded in a white hard matter, re- 
sembling quartz, but which, on proper examination, 
proved to be arsenic ;• a circumstance that evinces its be* 
I ing native tin, because the arsenic could not have retain- 
ed this form, if the tin had undergone the fusing heat. 
