OBSERVATIONS OF LUMINOUS METEORS. 365 



structure. A freshly broken surface of the stone is studded with these 

 chondra, and they are easily removed from the matrix. As regards their 

 mineralogical aspects, the spherules are found to be of two kinds. One 

 consists of small prisms of a rhombic mineral which has all the appearance 

 of a variety of enstatite ; others are found to possess all the properties of 

 olivine. These two minerals also constitute the greater portion of the 

 matrix. The augitic mineral occasionally contains opaque granules and 

 colourless microlites, the olivine pores or cavities, some of which, the 

 author states, appear to contain fluid. Metallic particles are rarely, if 

 ever, found in the spherules themselves. An accessory mineral, trans- 

 parent, pure, and with well-defined edges, is also to be found in the 

 meteorite. It differs from the rhombic augite in exhibiting no cleavage 

 fissures, from olivine by the smoothness of its polished exterior, and from 

 both of them by exhibiting distinct pleochroism with absorption ; one tone 

 being colourless, the other pale red with a faint tinge of brown. It 

 appears to be rhombic, and shows a close resemblance to a variety of 

 hypersthene found by Cohen in a gabbro from South Africa. The Zsadany 

 stone resembles those which fell on several different occasions at Lance, 

 Gopalpur, and Pultusk. 



By treatment with acid a considerable quantity of the silicate was 

 decomposed. The analysis of the portions thus separated gave the follow- 

 ing numbers : — 



Soluble Portion. Insoluble Portion. 



Silicic acid 44-56 56-71 



Alumina trace 2-32 



Iron oxide 1754 1321 



Lime trace 1-77 



Magnesia 3790 25-99 



100-00 100-00 



The stone, therefore, appears to consist to the extent of three-fourths 

 of a bronzite, the remaining fourth being an olivine, in which the equiva- 

 lents of MgO : FeO are as3 - 89 : 1, or approximately that which is often 

 met occurs in meteoric olivines. 



1876, June 28<7t, 11.50 a.m. — Stalldalen, near Kopparherg, Orebrolan, 



Siveden.* 



Attention has already been directed to this remarkable fall of aerolites 

 (see Report for 1876). The total number of stones found is eleven, and 

 they weigh collectively 34 kilog. Lindstrom finds the total composition 

 of a portion of one of these stones to be — 



Silicic acid 35-71 



Phosphoric acid 0-30 



Alumina 2-11 



Chromium oxide 0'40 



Iron protoxide 10-29 



Manganese protoxide 0-25 



Nickel protoxide 0-20 



Lime 1-61 



* A. E. Nordenskjold, ' Fciredrag i Mineralogi vid Akademiens iirshogtid den 3 

 April, 1877. (' Af tonbladets Aktiebolags Tryckeri,' Stockholm, 1877.) [See also, 

 1 Nature,' July 19th, 1877.] — G. Lindstrom, ' Ofversigt af Kongl. Vetenskaps Akad. 

 Forbandl.,' No. 4, 1877, p. 35. 



