362 Supplement to Dana’s Mineralogy. : 
Supposing the 5°71 of sulphur combined with manganese (of which it ores 977 
— é., ie makes 15:48 sulphuret of manganese), the analysis becomes, according to 
elsber ie 
Mn $1 §iss1s Bel 650 Fe 4:00 = 10057 
giving the lewd Mn S + [(Mn, tes ee Be Si and not according with the 
garnet formula. 
[Although this does not peels sustain the writer’s formula given in his Mineral- 
ogy, a comparison of the perc — corresponding - his formula with the above 
may be of some interest ; the percentage is as follow 
MnS 146 Si 3 341 Beos M hoe Hae 100.—p,] 
Helvin has been obtained at Brevig, Norway, in a zeolitic gangue: L, Semann. 
(Communicated.) 
Hereromenrite [p.199.]—In the Jahrb. k. k. geol. Reterte: - 18538, at 
p- 155, C. v. Hauer published an aa * heterpmerite from as given 
in the Min., » P- 169. In Kenngott’s Min. Notizen, No, 10, Kenngott Sabah a differ- 
ent result bg Hauer as follows: 
el gi Be,. tgp 
36° 39 22°25 B84 ‘81 trace 456 055 = 
This analysis gives the npaik ee nie for the ve rotoxyds, “sage and vale, 34:36, 
which if taken at 3:3: is the ratio of idocrase, to which species Kenn- 
refers it, as had arg dona saes the dankyeie in 1853, 
_ Kenngott in this paper reviews the analyses of idocrase, comparing the proportion 
of the porte and peroxyl but not, what is of more importance, the oxygen 
ratio of all the bases and si 
Horns E [p. 1  Wendeaatl éldite ep 5 to yes ap Not., No. a} 
is a var ‘ety sgh Auasipchre ee mixed with ce: e. y. Hauer of 
a specimen containing 38°27 p- c. of carbonates 
Hupsonite [p. 160 bi = Sesion observes (Min. fac No. 11) that the Hudson- 
ite has a aa — to a prism of 124°, like hornblende, and is near heden- 
bergit pite, in composition. 
fOn og this mineral, ip is like sahlite in structure, we 
the sales es of lamination, an ort leavage distinctly inclined about 
106° to the base, an another v: re much i e, but i nea en making an 
eb; in g i 
angle with the diagonal of about 135° ; the last appears to putes te to the lateral 
faces of the prism of pyroxene. No clea vage Parallel to a prism of 124° Js 8P" 
ci am 
The o deduced by Goa bay from his recaleulations of the analysis of 
Brewer, is the same given Wy the writer, that is 14:91:30-42—=1:2 for oe oxygen 
of the protoxyds and $i 
The recent “ay of Smith and Brush, 
Al Fe Mn Ca Mg K Na ign. 
38° 04 10-42 3049 060 1035 300 248 se 1:95 
Oxygen, . 20°63 4°87 670 013 2°96 1:21 0-41 
gives for the oxygen ratio for ths xyds and silica (41 ade) 11-84 : 25°50, 
erties is i iate between the fernbieads apd re ato former requir- 
ing 11°84: 26-64, the latter 11-84 : 23-68, ‘The mineral ir disnaas Peco 8 
know, had pina appearance of purity.—p.] 
HYALOPHAN, von Waltershausen—Description and analysis b; von : hae 
3 lin, 
figure 421 of 0 orthoclase, Min., p. 242) ==120° 36, Be li =130° 5 Mgt: li: Te=lil® 55’. 
By calculation, C (or iacliaaton of vertical = 64° Color white. 
=65; G.=2°711-2832, Crystals single, or in groups of to o tre Analysis 
(mean result): * 
Ca Mg Na Ba 5 H 548 
24127 49929 1570 0420 6742 14403: 2702 0650=994 
giving the eho et ee Silica 24-03, alomaiina ee ie 
: ie in oe + tag of the 7 
Tones Valley 
* 
