128 | W. F. Hillebrand—Calaverite from Colorado. 
4, Apatite and Hessonite in a Pegmatite from Canaan, Ct. 
South of the Canaan Valley post office and east of the small 
stream known as the Whiting river in the township of Canaan, 
Ct., the gneiss of the district is cut by veins of pegmatite in 
which occur several crystallized minerals. As the locality has 
not been described the minerals of these veins may deserve a 
passing mention. The most abundant of these are a white feld- 
spar which sometimes appears in crystals having dimensions of 
as much as eight inches, and a green or colorless muscovite in 
elongated hexagonal crystals measuring several inches on an 
edge. These muscovite plates frequently enclose quartz in 
bi-pyramidal crystals in form and size much resembling the 
well known quartzes from Edwards, N. Y. Biotite is less 
abundant than the muscovite and occurs in small black plates. 
Crystals and aggregates of black tourmaline as large as one’s 
fist are not rare. A cinnamon-colored garnet is found some- 
times in distinct crystals as much as a half-inch in diameter, 
sometimes intergrown with the feldspar so as to produce a 
structure resembling graphic granite. One crystal of green. 
apatite was found which was over two and a half inches in 
length and an inch in diameter. It was broken in removing 
from the rock, but the fragments show the crystal to be 
bounded in the prism zone by both the first and second order 
prisms in about equal development. A more careful examina- 
tion of the locality would perhaps reveal other minerals. 
Art. XV.—Calaverite from Cripple Creek, Colorado; by 
W. F. HInLeBRAND. 
THE occurrence of tellurium in the ores of the mining dis- 
trict of Cripple Creek, Colorado, has been known from an 
early day in the as yet brief industrial history of that region. 
That it was, in part at least, associated with gold was likewise 
known from the observance of a crystallized gold-tellurium 
mineral. Although the ores of the district are chiefly gold 
carriers, they contain also a little silver, and since recognized 
silver minerals had not been observed, or at most only in minute 
amount, it seemed probable that the silver was associated 
with the gold in the tellurium compound. Indeed, Mr. R. 
Pearce, of Denver, came to the conclusion, from his examina- 
tion* of certain ore concentrates, that this mineral was sylvan- 
ite. It is, however, of very sparing occurrence, so that it was 
* Proc. Colo. Sci. Soc., Jan. 8, and April 5, 1894. 
