‘ 
78 Improvements in Physical Science [Jan. 
dark variety is Y° Ta mixed with a small portion of C* Ta and Us 
Ta, together with a trace of wolfram. 
__ V. Experiments to determine the Composition of the Minerals 
containing Tungsten. By J. Berzelius. 
(1.) Wolfram.—The constituents of this mineral as determined 
by Berzelius, are 
WOUCSHC ACID ow ce ccc. . 78°775 
Protoxide of iron ...... »- 18°320 
Protoxide of manganese.... 6°220 
RIUERS) sloin nisin coeceeees 1°250 
104°565 
He considers it as Mg W +3Fe W. 
(2.) Tungstate of Lime.—This scarce mineral he found com- 
posed of 
TUR EIEC ACID 6 o.5:0:5 0. 9:° worp.s OAT 
Lime @eeeeoeepeeaeereevr eee eee 19°400 
99°817 
So that it is Ca + Ww. 
VI. Chemical Analysis of different Minerals. By W. Hisinger. 
(1.) Pyrodmalite from the Mines of Nordmark.—lts consti- 
tuents were, 
silicages d.'s « Miata a antateleteue's Soe 
Protoxide of iron ........ 21°810 
Protoxide of manganese .... 21°140 
Submuriate of iron........ 14°095 
Liamer ) sre 04's ai ete elas wees Hae DIO 
Water and loss ...... wees» 5895 
100°000 
(2.) Cerine.—Its constituents were, 
Birch. dao i SO1F 
Afamina’ Sods fhe Se aeees, 11°31 
FAME ctr arstcwicls sah haals sete Shi GZ 
Oxide of cerium .......... 28°19 
Oxide of GrGn | Fcc. be 4 Ua 
Oxide of copper ........ wo) O87 
Volatile matter ...... oF es 0:40 
100°78 
Hisinger considers it as C S? + 2 AS* mixed with ce S* + feS*. 
The common cerite of mineralogists is a mixture of hornblende and 
true cerite. 
(3.) A yellow Mineral from Longbanshyttan—Probably augite 
mixed with oxide of manganese. Its constituents were, 
2 
