1819.] _ Scientific Intelligence. 465, 
V. White Pyrites, or Radiated Pyrites. 
It is well known to mineralogists that the crystalline forms of 
this variety of pyrites are quite different from those of common 
pytites, and cannot be mathematically deduced from them. On 
that account, Haity has constituted it into a peculiar species, 
under the name of white pyrites. Werner distinguished it under 
the name of kammkies. Berzelius has lately subjected it to a 
careful analysis, at the request of M. Hatiy, to determine whe- 
ther any difference existed in its composition, as had been 
inferred from the difference in its crystalline characters. But 
he has been unable to discover any distinction whatever between 
white pyrites and common pyrites. He proposes to repeat his 
experiments on other specimens. Does this mineral constitute 
an exception to the science of crystallization as seems to be the 
case with arragonite ? 
VI. Phosphate of Manganese of Limoges. 
This mineral was discovered some years ago by Alluan, and 
sent to Vauquelin as an ore of tin. That celebrated chemist 
subjected it to analysis, and ascertained its composition. Ithas 
been lately subjected to a new analysis by Berzelius, who has 
found it a compound of one atom subprotophosphate of iron and 
one atom of subprotophosphate of manganese. The constituents 
extracted from it were as follows : 
Phosphoric acid . .......+++ 32°8 
Protoxide of iron. .......... 31:9 
Protoxide of manganese. .... 32°6 
Phosphate of lime .......... 3°2 
100-5 
Vauquelin’s analysis gave the constituents as follows : 
Phosphoric acid. .........2+- 27 
Ciside. of irons. + <0 cara dinrtveleniew ot 
Oxide of manganese.......++. 42 
100 
VII. Fibrous Quartz. 
Mineralogists are well acquainted with a variety of quartz 
which Werner, from its texture, denominated fibrous quartz. 
Mr. Zellner, of Pless, lately analyzed a specimen of this variety 
of quartz, from Hartmannasdorf. He found its constituents as 
follows : 
Eats pee jfeiats minis eolee DOVER 
Oxide: Of irons isiaiivewada sae c O76 
Winter. si, agaioerealects {isan Oe 
99°75 
Its specific gravity was found 2608. 
Vou. XIII, N° VI. 2G 
