af a i ge Se 
Mineralogy and Geology. 427 
can arrive at a correct interpretation of the true composition of this 
mineral. 
Nine analyses of the columbite from Bodenmais have been made in 
Rose’s seep by Rose, Afdéef, Jacobson, Chandler, Warren and 
Finkener, The empine§ examined eget the different densities 6°39, 
between ee —. an the Hypovdtimnbie acid in 5 ee analyses were: 
22407,.1: > 1: 3°7, 1: 3°87, 1: 3°56, 1: 3°53, 1: 3:4; 1:33:34, and 
1:3:16. 
€ specimens of columbite from Connecticut showed less alteration 
than those from Bodenmais. Among them, however, were some speci- 
: n 
the densities 6-048, 5-583, 5°708, 5°483, ties the same peculiarities 
in regard to streak and powder as observed in ae mineral, 
The oxygen ratios were 1:3°63, 1:3°48, 1:3°13 “ad 13 The speci- 
Mens which contained the largest amount of ypoeslambi ‘acid had the 
highest density, and had also a black powder 
e observes that the columbite occurring in the Greenland eryolite 
is unquestionably the purest yet found. The crystals have suffered no 
decomposition, and all the specimens have therefore the same specific 
gravity. Selected fragments gave this density as 5°374 to 5°376, in 
From — pasta ig Rose hie that in the purer varieties of co- 
Iumbite—t which have suffered no alteration or deccmpastiga ine 
oxygen of on hypocolumbie acid is three times that of the oxygen of 
the protoxyd of iron and manganese, that is, the relation of oxygen of 
the acid to that of the bases is as 3:1. An analogous relation exists in 
wolfram, the ratio between the tungstic acid and the bases being 3:1, 
and the bases also consist of protoxyd of iron and manganese.—Jour, 
prakt. Chem., \xxxv, 438. G. 3. 5, 
2. Kischtimite, a has mineral.—T. Korovarrr describes, under the 
name seagate , a new mineral from: the gold-washings of the 
| prakt, Chem., Ixxxv, 442). ‘The mineral was not enyinaliitad color dark 
brownish-yellow, steak much lighter; fracture sub-conchoidal; lustre 
tween greasy and vitreous; friable, and in small pieces transparent. 
a 
