126 Scientific Intelligence. 



The following are some of the angles obtained for uralorthite ; and 

 in parallel columns the corresponding angles of epidote and allanite 

 are given. The first three of uralorthite and the three measurements 

 by the reflective goniometer, from which the dimensions were calculated. 



Uralorthite. Epidote. Allanite fr. Orthite, 



Heidinger. Scheerer. 



U:d — 127°40' 126°56f 



M:T = i 114° 55' I 114 25£ 116° 113°— 116° 



o 



65°05' \ 65 34£ 64 



M:r = 116°20' 116 12^ 115° 116 



M:n = 105° 1' 104 48 j- 



T : r = 128°45' 129 22 129° 130°48' 



T : % = 125°25i' 124 57£ 



T:u = 144°53J' 144 25 



d : % — 156°28' 156 45£ 1562° 



Bagrationite (Pogg. Ixxiii, 182), also appears to be another variety. 

 The measurements gave M :T= 114° 55-2'; M:r=116° 35-6' ; U:n 



105° 10*5' ; T : r=128 c 29T ; T : %=125° 25'. 



The resemblance between the above minerals in composition is 

 striking, as shown by M. Kokscharov, from a comparison of various 

 analyses. 



23. Niolite. — This name has been applied to the Columbite in which 

 niobic acid is the predominant acid. Specimens from the east of Lake 

 llmen have been found to agree in crystalline form with the American, 

 as described by M. G. Rose. The mean specific gravity is 5*57. 



(J 



24. On the Yttrotantalite of Ytterby. — M. H. Rose announces 



same composition, the same metallic acids, and the same density, as the 

 tentalite of Finland. 



25. On Eukolite, a new mineral ; by M. Scheerer, (Ann. der Ph. und 

 €h., Ixii, 561 ; Annuaire de Chem., 1848, p. 150.) — Eukolite appears to 



Wohterite. in whi^h thfi arpnfpr nartnf thp •zirconium io ^placed by 



•sesquioxyd of iron. Scheerer obtained for its composition, silica 47*85, 

 metallic acids and zirconia 14*05, sesquioxyd of iron 8*24, lime 12*06, 

 protoxyd of cerium 2*98, soda 12*31, protoxyd of manganese 1*94, 

 magnesia a trace, water 0*94. 



26. On Crystallized Pitchblende; by M. Th. Scheerer, (ibid.) 

 The crystals of pitchblende are regular octahedrons with truncated an- 

 gles. Density 6*71. Composition, green oxyd of uranium 76*6, oxyd 

 of lead, metallic acids and silica 15*6, oxyd of manganese 1*0, water 

 4*1, loss and gangue 2*7. Scheerer does not state whether the metallic 

 acids are essential constituents or derived from the gangue. 



27. On Euxenite from Tvedenstrand ; by M. Th. Scheerer, (ibid.) 

 — Composition, titanic and metallic acids 53*64, yttria 28*97, protoxyd of 

 -uranium 7*58, ib. of cerium 2-91, ib. of iron, 2*60, water 404. Density 

 4*73, 4*76, 4-60. Approaches polycrase in crystalline form, crystalliz- 

 ing in rhomboidal prisms of about 140°, surmounted with a pyramid 

 whose obtuse culminant edge is nearly 136°. The prism of samars- 

 kite is 135 to 136° ; and the obtuse culminant edge of columbite 

 is 150°. 





