found at Makariwa, near Invercargill, New Zealand. 63 



Fig. 4. 



colours, and when its extinction takes place — which is in the lice of 

 the fissures dividing it into columnar bodies — the glassy substance in 

 most of the fissures and cracks shows oat perfectly clear and bright. 

 The very finely granular part which bounds the chondrule on the right- 

 hand margin and contains a number of larger grains, is also olivine, 

 judging from the polarisation-colours. Some of the nickel-iron 

 particles show dark spots and narrow dark rims, due to oxidation of 

 the metal. 



Fig. 5. — On the upper margin of this is shown part of a large 

 chondrule of enstatite, which is finely fibrous, with the fibre-lines dis- 

 posed in a fan-like manner. Around the margin it looks minutely 

 granular and somewhat dusty ; in the centre it is clear. Between 

 crossed nicols it polarises in shades of yellow and grey, and ex- 

 tinguishes in the clear centre part parallel to the fibre-lines, whilst in 

 the marginal dim part the extinction is cloudy. The large, finely- 

 dotted patch near the centre of the section consists of a mixture of 



Fig. 5. 



