366 Eighth Supplement to Dana’s Mineralogy. 
Cl Mg Mg Fe B i 
814 2°84 25°74 0°43 61:224 163 = 100 
a By the difference. 
from which he draws the formula a(iigs B+ MeO In communicating 
these 
oS of Heintz to the Berlin Academy, H sie (loc. cit.) adds that the bo- 
te from Liineberg also contains iilsine as an essential constituent, and this has 
bev substantiated by she: recent analyses of = eg? tit yka (Pogg. Ann,, cvii, 
433), and also by Heintz (Jour. £. prakt. Chem 
Potyka analyzed both boracite and stacntorthibe ‘aad four ana alyses of boracite 
are given by H eintz, maring been made under his direction by Siewert and Geist. 
The results are as follow: 
M, Meg Fe 8B iH | 
1. Clear boracite crystals, 10°90 25°24 159 62°91  055==10119 Potyi 
2. Clouded « 1041 2619 166.6119 694=10039 “ ‘ 
3. oo 1073 2615 040 60772 195=10000 “ . 
4, Borac 1114 2600 152 61:34¢ 100°00 Siewert 
5. 1171 2486 113 62302 —-=10000 * 
6 ~ ‘ 1111 25:45 1:83 61-614 =100°00 Geist. 
woe — — 105 61:98¢ ——=10000 “ ; 
y the difference. ; ; 
Potyka’s specimens, after pilvectonion, were Asioreer with cold water until the 
wash water no longer gave any reaction with nitrate of silver or chlorid of barium, 
he found that both boracite and s tasefurthite were slightly soluble in hot water. 
ihe Liineberg. Heintz was unable to 1 
boracite by the mute on 8 Aes a 62°50, Mg 26:86, MgOl 10°64=100. 
Bromyrire [p.9 2]— —F. Field ie analyzed the bromyrite which occurs in 
rg imbedded in peda of lime at Chanarcillo in Chile (Quar. Jour. Chaar 
241). The crystals had the color and lustre of amber, and are much harder t 
the chloro-bromids or chlori . and appear to be little affected by light. Composition, 
Br 
B73 42°57 = AgBr 
the 
Cancrinrre fp. 283, II].—P. v. Pusirewsky has analyzed the canerinité from 
— Mt ae a: d from Martinskaja i in the Tunkinsk Mts. (Kokscharow, Mat. Min. Ras 
ands, iii 
Si MOR Na te COU ae 
: Timen Mis, tly 2958 —— 1878 556 556 3°76 vas 
6°21 29°56 pels ar as 5°81 5:54 3°64 
3 Tunkinsk Mts., 373 27°75 21°60 $11 561 407 eee 
The yaiene from the Ilmen Mts. bias li re sigerteoe color and sp. Ee formals 
That fro m Mariinskaja ty 
was yellow, sp. gr=2-454, Pusirewsky writes the than the 
ae t28IS4N , Ca] G)-+ 3H, co containing on en more of water 
en by Whitney for the cancrinite of Litehfield, Maine. 
Cues [1II].—Heintz gives the composition of carnallite, a8 found by 
Siewe: 
KCl Natl = Ga i : 
6 27-41 0-23 114 36:33—-880 
— aivestoctl 1858, 739, 
118, V, V vu aa + letter (Boston, Jan. 8th, 
ire [p. Bt She n a recent letter ( wise gE 
180) 8" 4 
Prot B slimes se , DO ackson mentions 
masses , Dr. Jackson is led to suppose 
of workable magnitude sxtets 5 daisedinice ta ing eight inches in thieknes* 
