272 Scientific Intelligence. 
The needles contained traces of carbon, and oxyd of manganese, If the 
chlorine is considered to exist as MgCl and the iron as #e?2H3, and these 
composition of the mineral will be B 38-35, Me 54°63, H 7:00==100 
gives the formula 3(Mg5B?)4+4HO. A similar calculation made with No, 
2 gives B 36-13, Mg 51°52, H 12°35=100, and the formula 3(Mg*B*)-+8H, or 
4 atoms more of water than the crystalline variety, The composition is 
related to that of stassfurthite, this last minera being an acid hydro- 
borate combined with chlorid of magnesium, ‘i szaibelyite i is a basi¢ 
hydro-borate in which chlorid of magnesium is not an essential constitu 
ent. [The specific gravity of the borate with ve atoms of water i8 stat 
to be less than that with 8 atoms of nbs this is probably either a mis 
print or an error in observation.— 
4, Astrophyllite—F. Pisant has ‘ésaihined Scheerer’s astrophyllite 
It is a micaceous substance, found at Brevig imbedded in w flay 
the ri Abe cient is associated with catapleiite, ngihasi and large 
prisms of a black m It forms six-sided prisms, frequently lengthened 
in the direction of +s shorter diagonal, sometimes in  stellated groups 
and having a basic cleavage. In thin leaves translucent. Color brona- 
yellow. The powder resembles mosaic gold. Laminz only slightly 
elastic. H.=3, G.=8°324. Before the blowpipe swells up, and fuses 
easily to a black magnetic enamel. With soda and borax shows a strong 
manganese reaction. In the 2 spectroscope gives the lines of lime, Fr 
potash, and lithia. Decomposed by chlorhydrie acid with ae 
silicie acid in scales; the solution heated with zine or tin s the reac 
tion for titanic neha Analysis gave—silica 33°23, titanic ai 7-09, zit 
conia 4°97, alumina 4°00, ferric oxyd 3°75, ferrous oxyd 23°58, mange 
trace, og aaa ¥: « 1e Sayeea? ratio aie ca bases to vibe me 
5. 5 -Winaiite —J, A. Micnartson has analyzed a ante mn Hell 
in Norway, which he s says is the bragite of Forbes and Dahl. The ali 
eral is grayish-brown in color, has an uneven fracture and a met 
lustre. H1—=4°5. G.=5-40, With salt of phosphorus and borax ' 
— bead, eam is | greenish- -yellow while warm, and colorless on cooling: 
mpositio 
Pecan y Ge C. fin Co tg Po H 
$610 145. S871 748 4:95 1327 G11 182 089 OW TU 
from which Michaelson draws the formula — and considers the er 
ral to be identical with tyrite and fergusonit —d. f. pr. Chem, ‘pragite 
[Tyrite and furgusonite need further seechiaaten: it may be that 
and tyrite are identical, but the analyses of Hartwell, Weber a 
J. B:! 
would indicate that fer: nat HO and tyrite are distinet species. —& J 
6. 2 the 
Laurentian Rocks. of Canadas eu 
a letter to the Editors at Ny Journal ben Sit W.E. Lote to the . 
ted Montreal, Feb. 17th, 1864. .)—In August, 1859, 
+ 
