Mineralogy. 1039 
angle between O and 1, which was regarded as the fundamental 
angle, was determined to be O A 1, o001 A 1011 = 38°25/ and 
38°24%4'. The length of the vertical axis is then c = 0.68681, 
and from this the other angles are calculated. 
Curtous Gotp Crystats.—W. P. Blake! has described some 
curious forms of crystallized gold from Montana. There isa solid 
octahedral nucleus or head, with a long divergent brush-like ap- 
pendage on one side, resembling the drawings made of certain 
comets. The appendages are many times longer than the octahe- 
os ag the whole crystal is not over an eighth of an inch in 
ength. 
He also describes hexagonal prisms of gold terminated at one 
or both ends with pyramids. The planes are brilliant and the 
crystals show no signs of twinning. They are from Sonora, 
California, 
ALKALiEs IN Beryt—S. L. Penfield has shown that, so far as 
he has tested, all beryl contains more or less alkalies, sodium and 
lithium being always present, and sometimes cæsium. Water is 
also always present, and must be regarded in the formula. The 
alkalies, sometimes amounting to five per cent, are shown to re- 
place the beryllium, and the formula Al, Be; Hg Sin Os, is proposed 
as the one agreeing best with the analyses. 
New Minerat Anatyses.—F. W. Clark and T. M. Chatard, in 
Eskimo ; (2) saussurite, from Shasta county, California ; (3) al- 
lanite, from Topsham, Maine, where it occurs in slender black 
LOLLINGITE AND OTHER MINERALS FROM Cotorapo.—At several 
mines in Gunnison county, Colorado, associated with barite, sid- 
1 
2 i" Fourn., Sea 1884. 
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