INCLUSIONS OF BASIC PLUTONIC ROCKS AT KIAMA. 67 



[ relative, uneven 

 Granularity, < absolute, medium to coarse, individual 



I crystals up to 10 mm. 



Minerals visible, i. olivine, ii. pyroxene, iii. biotite 



b. Microscopic Characters. 



j Orystallinity, noncrystalline 

 Texture < Fabric, poecilitic for the most part 



( Grainsize, very uneven, averages 2*3 mm. 



Minerals present (in order of decreasing abundance) 

 i. olivine, ii. augite, iii. enstatite, iv. biotite, v. 

 magnetite. 



The olivine occurs as more or less rounded grains from 

 1 to 2 mm. in diameter enclosed in the larger augite crystals; 

 more rarely it shows crystal outlines. The characteristic 

 alteration into serpentine is present, but the mineral is, on 

 the whole, remarkably fresh. The augite occurs as large 

 alio trio morphic crystal up to 10 mm. in diameter, enclosing 

 the olivine crystals giving the characteristic poecilitic 

 structure. Enstatite is only sparingly present, as also is 

 the biotite, although in one fragment the latter is fairly 

 abundant. The order of crystallization was 1. magnetite, 

 2. biotite, 3. olivine, 4. pyroxene. 



III. Enstatite Peridotite. 



a. Megascopic Characters. 



Colour, yellow to yellowish-green 



Fracture, rough 



Orystallinity, phauerocrystalline 



Granularity I relative > even 

 granularity, ( absolute? medium 



Minerals visible, olivine, pyroxene, picotite. 



b. Microscopic Characters. 



| Orystallinity, noncrystalline 

 Texture < Fabric, allotriomorphic granular 

 ( Grainsize, average about 1*8 mm. 



Minerals present (in order of decreasing abundance) 



1. olivine, 2. enstatite, 3, augite, 4. picotite. 



