thin polished Laminae of the Knyahynia Meteorite. 427 



tively larger, and the grey substance is of somewhat lighter tint. 

 The margin is exclusively formed by the transparent fissured 

 mineral. The somewhat sinuated outline of the whole granule (or 

 rather of its section) is marked in some places by black granules. 

 A rounded section, 06 millim. in diameter, is merely a crystalline 

 granular aggregation of transparent silicate, with many black 

 opaque granules more approximated towards the margin than in 

 the central region. Wherever the rounded granules appear less 

 distinctly, the granular aggregations of the transparent silicate 

 are irregularly associated with the grey one, whose stripes are then 

 no longer perceptible. Where the grey silicate prevails (as in 

 the portion, 1 millim. in breadth, shown in fig. 5), the stripes 

 become more distinct and appear either parallel or divergent. 



The specimens hitherto described prove both silicates to have 

 crystallized simultaneously — one or the other of them, according 

 to circumstances, having accumulated around certain centres in 

 a spherical form, thus imparting to the meteorite, as a whole, a 

 somewhat oolitic aspect. An alternation of substances within 

 one and the same granule, as it occurs in globular diorite, is seen 

 in the section of a granule 1*5 millim. in diameter. In its 

 interior the grey mineral with irregular fine stripes is associated 

 and partly framed with the black opaque substance (see fig. 6) . 

 Around this central portion is a granular aggregation of the 

 transparent fissured silicate, locally interspersed with granules 

 of the black opaque substance and of metallic iron. The outer 

 border is marked by irregular particles of iron bordered with 

 black substance. Small yellow granules of magnetic pyrites, 

 associated with black substance (as in fig. 2), appear on the left 

 side. 



The grey mineral is likewise the essential component of an- 

 other rounded granule, - 36 millim. in diameter, some few 

 linear individuals appearing more conspicuously. A broad mar- 

 ginal zone includes some black granules. The whole granule is 

 surrounded with portions of the three opaque minerals, compa- 

 ratively more extensive than those in fig. 6, and themselves parts 

 of a more extensive zone of granular crystalloids of the trans- 

 parent mineral, whose intervals are filled up with amorphous par- 

 ticles of the grey mineral. This zone gradually vanishes into 

 the general aggregation. 



A third granule, 1 millim. in diameter, shows likewise a grey 

 nucleus and a surrounding transparent zone,both including abun- 

 dant particles of black substance and magnetic pyrites. 



Fig. 8 is a portion of the transparent mineral, 1 millim. in 

 length and 2 millims. in breadth, whose appearance and optical 

 condition are those of one single individual, interwoven with an- 

 other dark greenish brown, faintly pellucid mineral, and itself ex- 



2E 2 



