1887] me Mineralogy and Petrography. 763 
of Prudelles, Puy-de-Dôme." A mica-gneiss similar to the 
~ granulite of Térnebohm is described by Sjögren? as occurring 
-inthe iron regions of the Banat. Sjogren finds that the ores 
“are not connected genetically with the intrusion of banatite, as 
has heretofore been supposed. In his geological sketch of 
tt of the Galician-Hungarian East Carpathians Dr. H. Zapa- 
= lowicz3 gives a few notes on the schists and intrusive rocks 
occurring in the more mountainous regions of the Carpathians. 
Mineralogical News.—Svitvenite is the name proposed by 
Darapsky ¢ for a mineral from the Alcaparroso Mine, near Co- 
piapo, in Chile. Its analysis yielded: 
: So ALO M Na,O K,O H,O 
; 36.1 H6 I ea ay wace 47. 6 
___ This corresponds to a composition represented by the formula 
n (%Na,%4Mg)So, + Al,(So,), + 24H,O. The mineral occurs in 
š acicular crystals grouped in radial masses. Before the blow- 
pipe it presents the features of the alums, to which group of 
In the same 
oar As Fe SiO. 
a i: 98.20 0.96 5 30 (Mean of two analyses): 
Specific gravity equals 5.50. It is soft, and of a brilliant metallic 
; lustre, It is probably identical with the arsenglanz of Breith- 
1c and triclinic systems. C. Schmidt® recently having the 
ia to reinvestigate the crystallography of scolecite, 
s that this mineral crystallizes only in the monoclinic 
and that the triclinic variety described by Luedecke was 
* Comptes Rendus, civ. p. 719. 
= Jahrb. a. k. ke. geol. Reichsaust, 1886, p. 607. 
+» P- i. 
_ 4 Neues Jahrb. f. Min., 1887, i. p- 125. 
_-§Zeits. f Kryst., xi. p. 607. © 6 Ib., p. 587- ~ 
