1006 : The American Naturalist. [November 
with its original flowage structure and the shapes of its included frag- 
ments well preserved through silicification. Calcite, glassy feldspar, 
and chlorite are the only minerals, with the exception of quartz and 
chalcedony, that can still be detected in the rock. In a report on the 
iron ores of Minnesota," by Messrs. N. H. and H. V. Winchell, Dr. 
Hensoldt describes a few of the rocks associated with the ores. Among 
them are various green schists, jaspers, chalcedony, etc. 

Mineralogical News.—American Minerals. —Within the last few, 
months a large number of articles have appeared containing the results 
of investigations of American minerals. Prof. Genth” reports some 
analyses of interesting minerals from the United States and Mexico. 
Bladed crystalline masses of ‘efradymite from Bradshaw City, Yavapai 
o., Ariz., consist apparently of orthorhormbic plates, whose composi- 
tion corresponds to Bi,(Si,Fes,) [Bi = 62.23; S= 4.50; Fe= 33-25]; 
so that in all probability the mineral belongs in the stibnite group. 
Ziron from Mars Hill, Madison Co., N.C., yielded him: SiO, = 31.83; 
ZrO,=63.42 ; Fe,O,=3.23; Loss=r.20. Itsspecific gravity is 4.507- 
Small crystals of scapolite associated with garnet at Elizabeth Mine, 
French Creek, Pa., gave: 
SiO, pre Fé0, MgO CaO NaO KO CO, Los Sp. Gr. 
52.30 23.68 .58  .05 12.36 6.29 -77 2.63 1.50 2.675 
Both minerals appear to be alteration products of essonite. The 
garnet is brownish-gray or ash-gray in color. Its composition is given 
opposite (I.). A titaniferous variety, from the Jones Mine, Henderson 
Co., N. C., has a composition as opposite (II.): 
SiO, Al,O, Fe,O, FeO Mgo CaO MnO TiO, CO, Loss Dens. 
(I.) 41.42 18.09 10.81 59 26.19 .88 rjr sr Se 
(IL.)35.56 4.43 20.51 1.88 .17 31.90 4.58 55 3-738 
Analysis of pyrite from French Creek, Pa., and of ad/anite, are also 
given in the same paper. The green substance associated with the 
gold at Los Cerillos, N. M., supposed to be turquoise, was found in one 
instance to be chromiferous clay, and in another to be cupriferous quarts. 
Pseudomorphs of the latter mineral after stibnite are mentioned by 
the author as occurring at Durango, Mexico. In another article Prof 
Genth ™ gives the result of an examination of /eftsumite from the Cop- 
11 Bull. No. 6, Nat. Hist. and Geol. Survey of Minn., p. 429. 
12 Amer. Jour. Sci., August, 1890, p. 114. 
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