1892.) Mineralogy and Petrography. 778 
density of 4.695 and a composition of ZrO = 67.31; SiO, = 33.42. 
The author also describes cubical and octahedral crystals of pyrite 
from Porkura, Hungary. Enargite from Cerro Blanco, Atacama, 
Chile, has a density of 4.51. It contains S = 32.21; As = 18.16; 
Cu = 47.96; Fe = 1.22; Zn = .57.——The amber-like substance” 
occurring in the sands of Cedar Lake, near the mouth of the Sas- 
katchewan River, in Canada, has been found by Harrington” to have 
the following composition: © = 79.96; H = 1046; O = 9.49; 
As = .09. Its hardness is 2.5 and density 1.055. From its reaction 
with solvents the author concludes it to be retinite. Lacroix and 
Baret™ find bertrandite at Mercerie in the Commune of La-Chapelle- 
sur-Erdre, France. It occurs in crystals elongated parallel to the base, 
associated with orthoclase, albite, quartz and apatite, in a granitite. 
Neufvile, Ib., 1891, p. 75. 
Amer. Jour. Sci., Oct., 1891, p. 382. 
Bull. Soc, Franç. d. Min., xiv, p. 189. 
