S4B 
Tin. 
The massive varieties occur commonly in coarse, small 
and fine granular distinct concretions. 
It alternates from semitransparent to opaque ; the dark- 
er coloured varieties are opaque, the lighter translucent 
and semitransparent, often even inclining to transparent ; 
the intermediate varieties are only translucent and trans- 
lucent on the edges. 
Yields a greyish- white streak. 
Is hard, but does not give fire with steeL 
Easily frangible. 
Specific gravity, 6 to 7. 
Chemical Characters . 
Before the blow-pipe, it decrepitates, becomes paler, 
and where it rests on the charcoal is reduced. When 
roasted, it is converted into a grey oxyde. Acids dissolve 
the iron it contains, but only a very minute portion of the 
tin. 
Constituent Parts . 
From Alternon, Schlakenwald. Ehrenfriedersdorfi 
Tin, 
77.50 
75.0 
68 
Iron, 
0.25 
0.50 
9 
Oxygen, 
21.50 
24.50 
16 
Silica, 
0.75 
7 
100 
100 
100 
Klaproth • Klaproth . Lampadius . 
Geognostic Situation . 
In occurs only in primitive rocks 9 as granite, gneiss, 
mica-slate and clay slate, and is the oldest of all the me- 
tals. It occurs either disseminated in the rock, or in 
stockworks , beds, or veins. It is usually accompanied 
with quartz, mica, lithomarge, steatite, wolfram, tungsten, 
arsenic-pyrites, copper pyrites, iron-pyrites, molybdena. 
