770 H. S. WASHINGTON DECCAN SALTS AND PLATEAU BASALTS 



is no glass, or at least only a minute amount. Analyses of the Kolhapur 

 and the Nasik specimens are given in the accompanying table. 



(b) Coarse, ophitic, subhy aline. — This type seems. to be more common 

 than the preceding and may be divided into two kinds. In the one the 

 glass is very dark, and this is represented by specimens from Amraoti, in 

 Berar (30/356) ; Mainpat, in Central Provinces (30/365) ; and Eaja- 

 mundri,* in Madras (29/321). In the other the glass is yellow, as seen 

 in specimens from Panandrao,* Cutch (3/159), Bhourameta Hill, 

 Chhindwara* (26/172), Padmi,* Manclla (28/557), and Pipardahi* 

 Station, Seoni (28/558), the three last being in the Central Provinces. 



Megascopically, this type resembles the noncrystalline one, but the 

 specimens (except Eajamundri) are finer grained and are more generally 

 a slightly greenish black, that from Eajamundri being a decidedly brown 

 black. The specimens with yellow glass appear to be, on the whole, rather 

 finer grained than those with black glass. There is the same glistening 

 of fine feldspar laths as in the preceding type. All the specimens are 

 densely compact except that from Eajamundri, which is rougher and has 

 many minute irregular submiarolitic cavities. Microscopically, this typo 

 is much the same as the other, except for the presence of glass. The 

 ophitic texture is identical, as are the labradorite tables and the inter- 

 sertal augite grains, although the augite of the specimens with yellow 

 glass is decidedly less brown than it is in those with black glass. A 

 little magnetite occurs in this type, but in much less amount than in the 

 holocrystalline one, and in a few cases it is almost entirely lacking. The 

 glass is interstitial between the feldspar and the augites, and its amount 

 is not more than about 10 per cent. The "dark" glass is of a deep brown, 

 which is caused by the presence of abundant "dust" grains. The yellow 

 glass is of a clear, bright, lemon color, and, while most of it is fresh, in 

 some cases it appears to be slightly decomposed, as it shows some aggre- 

 gate polarization. 



(c) Fine grained, sub ophitic, holocrystalline. — The following locali- 

 ties are represented by this type: Ketool Hill, Cutch (3/144); Kath- 

 iawar (3/603) ; Doondea Hill, Hirawari,* Central Provinces (27/165) ; 

 Belgaum (30/367) and Eatnagiri (30/368), Bombay Presidency; and 

 Hingancy, Hyderabad (29/348). 



The basalts of this type are densely aphanitic and compact, without 

 phenocrysts, and of a pure black or slightly brownish or greenish black 

 color. The microscope reveals the same minerals as in the preceding 

 types, but in smaller crystals, the labradorite tables seldom reaching a 

 length of 0.5 millimeter and being generally from 0.1 to 0.3 long. The 

 fabric is somewhat ophitic, but the feldspar tables are more widely scat- 



