262 Progress of Science. (April, 
mony and iron, and part of the copper by silver. The ore was formerly found 
in the Friederike-Juliane Mine, at Rudelstadt, in Silesia. 
Under the name of Beyrichite, Prof. Liebe describes a new species from the 
Westerwald. It is found in groups of macled prisms, of a lead-gray colour, 
with a faint metalliclustre. Its compositien may be formulated as 3NiS.2NiS2 3 
but the mineral contains a variable proportion of iron, which, in this calcula- 
tion, is supposed to replace the nickel: if the iron, however, be due to the 
presence of iron pyrites, the formula of Beyrichite becomes 2NiS.NiS3. 
A native silicate, hitherto undescribed, has received from Herr Frenzel the 
name of Bismuthoferrite. It occurs, with a variety of hypochlorite, at Schnee- 
berg, in Saxony, and contains Biz03.2Fe203.4Si0O3. 
Trigerite and Waipurgine are two new species, of which preliminary notices 
have been lately published by Weisbach, of Freiberg. Both are arseniates of 
uranium from Schneeberg, but the composition of ‘the former may be repre- 
sented as 5Ur203. 2AsO;+20HO, whilst that of the latter coincides with the 
following formula :—(5Bi2,03.3 Ur203)2AsO5+10HO. 
Some little time back a new fluo-phosphate of alumina was described by 
MM. Des Cloizeaux and Moissenet. As the mineral came from the tin-mines 
of Montebras, in Central France, it received the distinctive name of Monte- 
brasite. The substance occurs abundantly in parts of the gangue of these 
veins, and is accompanied by fluor-spar, apatite, chalcolite, wavellite, and tur- 
quois. Its analysis led to the following formula :—2(Al,F3.3 MF) + 4A1,03.3POs. 
M. Pisani, not satisfied with its determination as a distiné species, has lately 
examined the mineral afresh, and from his analysis declares it to be identical 
with the mineral known as Amblygonite. It appears, then, that the mineral 
of Montebras does not possess characters sufficiently diagnostic to entitle it to 
take rank as a distiné&t species; but, nevertheless, the discovery of so rare a 
mineral as amblygonite in large quantity in these mines is a matter of much 
mineralogical interest. 
Dr. Streng announces the discovery of Tridymite (Vom Rath’s species of 
silica) in an orthoclase porphyry near Waldbokelheim, where it occurs in 
crystals of similar form to those found in trachytic rocks. 
Some zeolitic minerals from the dolerites of the Bergonne limestone have 
been described by M.Gonnard. The dolerite is strongly magnetic, and certain 
specimens exhibit marked polarity. Where the rock becomes amygdaloidal 
the cavities contain zeolites, of which three are here specialised—namely, 
mesole, in globules of dull white colour; christianite, not the felspar so named 
by Montecelli; and the variety of chabazite known as phacolite. 
The Greenland meteorites noticed in the last number of this Journal have 
been made the subject of a further communication to the Geological Society, 
in which Prof. Nordenskjold describes carefully the conditions under which 
the masses of iron occur at Ofivak, and also gives analyses of the metal. A 
portion of one of the largest blocks yielded—lIron, 84°49; nickel, 2°48; co- 
balt, 0:07; copper, 0°27; magnesia, 0-043 sulphur, 1°52; phosphorus, 0°20; 
chlotine, 0°72} organic matter, water, and loss, 10°16. Nordenskjéld adneres 
to his opinion that these remarkable masses of metal are genuine meteorites. 
Success continues to attend the diamond workings in South Africa. At 
present the most active operations are going on at the ‘* New Rush,” on the 
Colesberg Koppie. Mr. Gilfillan has just returned to this country with some 
remarkably fine diamonds, accompanied by samples of the associated rocks 
and detrital matter. We have had an opportunity of examining these speci- 
mens, and believe that the results of Mr. Gilfillan’s observations on the con- 
ditions under which the diamonds are found will shortly be communicated to 
the Geological Society. 
