On Xepbt'lir.e-)ias;vlt from \'ingé-uu>u, Manchuria. /■ 9 



character .seems to be a ^^pecial feature of this rock. Tliere occur in 

 the general mass glittering flecks (0.9 by 0.:] mm.) of oHvine witli 

 conchoidal fracture and vitreous luster, seen only by reflected light. 

 The rock weathers into an ash-gray earthy mass with brown 

 limonitic spots of decomposed olivine projecting from the general 

 ground . 



Macroscopically, the rock is hjqîocrystalline, varying in degree 

 from percr3^stal]ine to docrystalline ; and microcrystalline in cry- 

 stallinity and ranging in size from decimillimeter to micron in 

 granularity; it has inequigranular, prismoid (augite) and equant 

 (nepheline), diverse and seriate (augite, nepheline) fabric. As 

 in all basaltic rocks, the olivine is of a relatively large size as 

 compared with the other constituents of tlie groundmass. So the 

 fabric may properly be called seriate-porphyritic. On account of 

 the isometric habitus of the microphenocrysts of both the augite'^ 

 and the olivine, the texture of the rock is orthophyric, showing 

 no signs of fluidal arrangement of components. The rock pro- 

 bably crystallized out from an undisturbed magma. (PL I. 

 ß(ß. 1 and 2.) 



Titanaiujite is a dominant ingredient occurring in the form of 

 rnicrohte of variable size, the largest being 0. 17 iinii. long and 0.037 

 broad. The larger ones, rarety seen in slides, are anhedral and 

 tabular with the cleavage-plane toward (Oil); the smaller ones, on 

 the other hand, are microlitic and euhedral. The extinction of 

 the former on (010) is 43°41' toward the obtuse angle. The color 

 is yellowish-brown with a tinge of violet-green, and then zonally 

 colored, the interior being of a violet shade; non-pleochroic, the 

 polarization-color being a grayish-yellow of a low order. The 

 crystals are often transversely cracked, and are full of air-pores 



I) 'rhe larger anhedra are nut seen in the photomicrogra;)hs, PI, T.figs, 2 and 3. 



