SCIENTIFIC SUMMARY. 
435 
which points to the formula Sb 2 0 3 , H 2 0. So incomplete an analysis 
hardly justifies the giving a new name to the substance. — Huntilith is a 
new mineral, of which two varieties have been found. One is massive, 
has a dark slate gray or black colour, is dull, amorphous, porous, and 
friable ; the other is apparently crystalline, shows a cleavage, a bright 
slate colour, and occurs in calc-spar, is half malleable, has a hardness of 
2£. The density of the two varieties at 0° after impurities had been 
removed is, of the amorphous 7*47, for the crystalline 6*27. The chemical 
composition of the two sorts were found to be — 
Arsenic 
I. Amorphous 
Variety. 
. 21-10 
II. Crystalline 
Variety. 
23-99 
Antimony 
3-33 
4-25 
Sulphur 
0-78 
1*81 
Mercury 
1-04 
1-11 
Silver .... 
. 59-00 
44-67 
Cobalt .... 
3-92 
7-33 
Nickel .... 
1-96 
2-11 
Iron .... 
3-06 
8-53 
Zinc .... 
2-42 
3-05 
Water .... 
0-19 
033 
Gangue (silicate) . 
0-88 
0-55 
Do. (calcite) . 
2-35 
1-10 
100-03 
98-83 
If the mercury be present as amalgam, Ag 2 Hg, and the sulphur as pyrites 
as is most probably the case, and the Co, Ni, M, and the remaining Fe be 
reckoned with the Ag, making B" = 2B', we have in 
I. B' : As + Sb as 319 : 110 or as 2-90 : 1. 
II. B ' : As + Sb as 332-5 : 110 or as 2‘99 : 1. 
Hence the mineral has the formula, Ag 3 As, and may be regarded as an 
arsenic dyscrasite or a silver domeykite. This huntilith is found in large 
quantities in the Silver Islet Mine of Lake Superior, and is named to honour 
Dr. Sterry Hunt. — (Zeitschrift fur Kryst. und Minerdlogie , 1879, iii. 596-600.) 
Swedish Minerals. — Blomstrand in a recent letter to the Ber. deut. chem. 
Gesdlschaft , 1879, xii., 1723, communicates a few notes on recent researches 
on Swedish mineralogy. Hjalmar Sjogren describes native bismuth, asso- 
ciated with galena and pyrites, from Norberg’s mine in Wermland. Bjelkite 
is’the name given to a mineral species having the formula 2PbS,Bi 2 S 3 . The 
older analyses of this mineral by Lundstrom have led him to adopt the 
formula (FeS, 2PbS) 3 Bi 2 S 3 . A new bismuth sulpho-salt, galenobismutite, 
has the formula, PbS,Bi 2 S 3 , and occurs in compact, tin-white particles. 
Anton Sjogren has published a paper on the occurrence of manganese 
compounds in the Nordmarks mine in Wermland. It treats of the very 
interesting gangue-like formation, distinguished for the manganese com- 
pounds which it contains, met with first in Langbans mine, and now hit 
upon in Nordmarks since. The ground mass is manganesiferous calcspar, 
which contains manganosite (the formula being MnO) in well-developed 
f f 2 
