60 The American Naturalist. [Januaryy 
described as opaque and black. Its hardness is 5.5 and density 5.488. 
Its crystals are square tetragonal prisms and pyramids like those of 
zircon. It is infusible before the blow-pipe, and is insoluble in the sim- 
ple acids. It dissolves readily in a mixture of nitric and sulphuric 
acid, and in aqua regia. In nine-tenths of a grain of material, the fol- 
lowing constituents were found: 
SiO, w ZrO,(?) ThO, La,O,.Y,0, PbO FeO CaO MgO K,O (NaLi),O P, Os HY 
13.90 22.40 88 45.30 1.86 3.74 1.15 .59 .10 4.81 
The new mineral thus differs from thorogummite in the possession of 
one molecule of thoria. 
Canfieldite is a new germanium mineral from somewhere in Bolivia.” 
Its crystallization is regular, small crystals being bounded by the octa- 
hedron and the dodecahedron. The hardness is 2.5, density 6.266, 
lustre metallic and color black with a purplish tinge. Its streak is 
grayish black and degree of fusibility 1.5 to 2. Upon analysis, the 
following result was obtained : 
S Geo. Ag Ke Zp. Ins. Total 
17.04 6.55 76.05 13 29 = 100.06 
which corresponds to the formula Ag, Ge S, A re-analysis of the 
Freiberg argyrodite yields results that accord better with the formula 
oregon than with the formula Ag, Ge S, proposed for it by its dis- 
cover, Winkler.” Both minerals have the same composition, conse- 
quently, since argyrodite is monoclinic, they are dimorphs. 
Marshite—This copper iodide” occurs at Broken Hill, New South 
_ Wales, as tiny crystals implanted on a siliceous cerussite. The crys 
tals are probably hemihedral-tetragonal. In color they are reddish- 
brown, in lustre, resinous. They possess an orange yellow streak, are 
transparent and brittle. 
Kehoeite, from Galena, Lawrence Co., S. D., forms seams and bunches 
in the galena of the Merritt mine. The material is white, amorphous 
and insoluble in water. Its analysis yielded Headden™ the following — 
S: 
P,O; SO, ZnO CaO AlO, Fe,0, MgO Cl H,O Ins. Total 
26.76 .50 11.64 2.70 24.84 78 08 tr. 31.06 1.76 = 100.02 — 
"S, L. Penfield, Amer. Jour. Sci., XLVI, 1893, p. 101. 
u Jour. f. prakt. Chem., XXXIV, 1886, p- 177. 
12 C. W. Marsh, Proc. Roy. SL N S. W. XXVI, p: 326. 
13 Amer. Jour. Sci., XLVI, p. 22. 
