} 
ge 
Eighth Supplement to Dana’s Mineralogy. 369 
ite, 
of an inch in thickn aes) s an opaque mineral, translucent in ery thin Pa 
ous; lustre = Aon sees a ite or yellowish-white wax; H.=3°5. 
B.B. fusible piel. intumescenee It was imperfectly damned by chlorhydric 
acid, Two analyses gav 
Bi 7 e Ca Mg kK H 
1, 5813 12°21 101 9°49 183 0°37 15°96=99°00 
2 BT 02 13'11 1272" 1016 191 undet, 15429888 
The iron and potash in No. 1 bgt enna out by chlorhydrie acid—a ~— 
with carbonate of soda was made to complete the decomposition. The loss in the 
analyses is supposed by Prof. How to te due alkali not determined. The catia 
between R, #, Si, H is as 1:2:9:4, and gives yh formula 3CaSi+2418i*-+-12H= 
Bi 5806, £1 14-60, Ga 11-96, 1 15°38, 
Datuoure ip ese Iv, Vio > ee ee scribed a peculiar variety 
of this mineral, which occurs in no odules in the Minnesota mine, Lake Superior (this 
Jour. [2], xxviii, 18). The mineral is quite compact and —_ with a conchoidal 
fracture; it is Bye tanghs white and opaque, eggeagse | in physical character the 
fee and most. clo ose-grained marble. H.=45; sp. gr. 2°983. Aula by C.F. 
ee Fe, Al Ca B (loss) H 
87-41. 0°35 95:11 21°40 5°13 = 100. 
la has in his collection, a crystal of datholite from Baveno, 44 inch . long by 
wacker reid: and 14 inches in thickness—(Wien Akad. Berichte, xxix, 2 39.) 
Dusrorr.—See under Watrolite. 
Ewsourre [p, 93].—F. Field has given analyses of three varieties of chloro-bro- 
Sine silver from ec in the province of Atacama (Quar. Jour, Chem. Soc., 
g Br Cl 
1 68-22 16°84 1492 = 99°98 
2 66°94 19:82 1318 == 99:04 
x 8. 61:07 33 500 = "89 
% 1 had a pale green color, and xa toneee 2AgCl+AgBr. No. 2, of a darker 
color, and Where frequen ntical with Breithau ’s embolite, as 
roma Plattner, TagCl}2Agk >ASBr. met sn rte very dark green color, some- 
ur le tint, its formula is ae - 
Under'the ao & me gabrom mite and Fo soy Breithaupt has described two 
lew Seip of silver (B. u. H. Zeit., x xviii, 449). I dh rage? ra 
; color siskin to pistachio-green, changing on exposure to peg 4 
A streak pale green. ig poe form cubic ; cleavage ble | 
males istinct ; fracture conchoidal and uneven ; slightly mallea ere 
tans 5 Sp. gr. 6:230—5-234, ciaek compact limestone. Analysis by T. 
eae = 
Ae 19 26°49 9°32 
ite Ag, Br and Cl are as 2:26: 1°26: 1, or as 9:5: 4oAhgOL-s gh 
Ma very ae resemblance to embolite in physi sical characters. 
Uikrobromite, Lustre en) color between asparagus an —- 
ex, on exposure e becomes ash-gray and opaque; streak whites . ce tile 
and mal] Gesie ma fact fracture arene ape hia rag oe wih native silver ina 
Sp. gr. 5 
Miles per carer Bin ees at Copiapo in Chile. wre 
Ag 
1. 70-28 1285 
2. 69°81 12° 
Sent? Of Ag, Br and Cl is as 4:1:8, giving te formal A e-thagth 
ND SERIES, Vou XXIX, No. 87.-MAY, 
47 
