Br. Walter Flight— History of Meteorites. 593 



I. agrees with Dotaeyko's analysis as regards the iron ; II., a very 

 imperfect analysis, accords rather with the formula of pyrrhotite 

 than troilite ; and III. differs considerably from the numbers corre- 

 sponding with the accepted formula of schreibersite. 

 The composition of the portions separated with acid is : 





Si0 2 



A1 2 3 



Fe 2 3 



FeO MgO 



CaO Na 2 





A. Soluble .. 



. 44-13 



trace 



— 



13-52 42-35 



— trace 



= 100-00 



B. Insoluble .. 



. 49-98 



5-46 



098 



16-79 23-31 



3-48 trace 



= 100-00 



In the soluble part the oxygen ratios are approximately those of 

 olivine, in the insoluble part those of pyroxene. While the pre- 

 sence of olivine could not be detected in the mass by any crystalline 

 features, in the insoluble part three minerals were recognised. The 

 most apparent has a blackish-brown colour, lamellated structure and 

 a specific gravity = 3-35. The composition was found to be : 



Silicic acid 51'61 



Alumina 7'36 



Iron protoxide 24-54 



Magnesia 16-05 



Lime 368 



103-24 

 The second is white and granular, and possesses the following 

 constitution : 



Silicic acid ... 55-76 



Magnesia 41-85 



Lime ... 3-89 



101-50 

 and closely accords in composition with one of the three (III.) 

 varieties of enstatite met with in the Busti meteorite (see page 411). 

 A third mineral, to which Meunier has- given the name of victorite, 

 resembles hypersthene, occurs in colourless and transparent crystals 

 in a geode of 5 mm. diameter ; they form six-sided prisms terminated 

 with four-sided pyramids. Through some fragments very small 

 opaque black grains are disseminated, with here and there the cavi- 

 ties and rounded enclosures first observed by Sorby. The prisms 

 are grouped in a remarkable way. This mineral, which is present 

 in so small a quantity that none of it could be sacrificed for analysis, 

 has been declared by Des Cloiseaux from the following measure- 

 ments to be enstatite : 



g 1 m = 134° 3' to 134° 20'. 



g 1 h l = 90° 40'. 



g'm on h 1 = 46°. 



m h 1 = 137° 20. 



mm' on h 1 = 93° 0' to 93° 40'. 



h'm (left) = 136° 25' ; and 135° 40' (?>. 



g l m' = 134° 0' ; and 134° 40'. 



mm' on g 1 = 88 1- 40'. 



Meunier finds this meteorite to be identical, as regards composition, 

 with that which fell at Tadjera, near Setif, Algiers (1867, June 9th), 

 in which also he recognised the presence of this variety of enstalite. 

 (See page 595.) 



