OE WT T AES ee NTR aer E 
1894.] ‘ Mineralogy. ; 877 
New Sulphostannate from Bolivia.—In 1893 Penfield de- 
scribed a new isometric germanium mineral from Bolivia, which had 
the formula Ag, Ge S, and which he named.canfieldite. This he 
showed to be identical chemically with Winkler’s Freiberg mineral 
argyrodite, which that chemist had given the formula Ag, Ge S, and 
which Weisbach had considered monoclinic. Weisbach has since 
found that his earlier determination of the symmetry was incorrect, it 
being isometric tetrahedral and identical with the Bolivian min- 
eral whith should hence bear the name argyrodite. Penfield now 
transfers the name canfieldite' to a new sulphostannate of silver from 
La Paz, Bolivia, having isometric symmetry. A part of the tin is re- 
placed by Germanium. The formula of the mineral is Ag, (Sn Ge) S, 
argyrodite being Ag, Ge S, The two minerals have similar physical 
properties, and are evidently isomorphous. 
Allanite from Franklin Furnace.—Eakle" has made a crystal- 
lographical study of the allanite from the Trotter Mine, Franklin 
Furnace, N. J. The crystals occur in a granite dike associated with 
zine ores. They are variable in habit and exhibit in all fourteen forms, 
none of which are, however, new to the species. The same author de- 
scribes the tourmalines* from Rudeville and Franklin Furnace. 
Miscellaneous.—Model” has found molybdenite and molybdite 
in the serpentine of the Rothenkopf, Zillerthal—. Carnot” has made 
an examination of the composition of wavellite and turquoise. In 
four analyses of wavellite from Cork, Ireland; Clomnel, Ireland; 
* Chester, Etats unis" (probably from Pennsylvania); and Gar- 
land, Arkansas, the fluorine was found to be 1.90, 2.79, 2.09 and 1.81 
per cents respectively. Carnot proposes for the mineral the formula 
2 (P,O, Al,O,)+Al, (0O,F;)--13 H,O, but in the light of the recent 
work of Penfield, it seems more probable that part at least of the 
water present, is water of constitution, and thatthe fluorine replaces hy- 
droxyl and not oxygen. In two specimens of turquoise of mineral 
origin (from Persia and Nevada respectively) no fluorine was found, 
Two specimens of occidental turquoise (odontolite) yielded each over 
three per cent of fluorine. The entrance of fluorine into odontolite 
during its derivation from fossil teeth, the author was led to expect 
from his study of the composition of fossil bones of the different 
geological ages. 
, Am. our, Sci., [8], xlvii, pp. 451-4. : "i 
Tra i s N. Y. al ^ L9, xii, p. 102; also Am. Jour. Sci, [3] xlvii, pp. 
"Am. Jour. Sci., [3], xlvii, p. 439. 
Tscherm. min. u. rog. Mitth., were 
Comptes rendus. cxviii, pp. 995-8 
