212 



SiO^ 36-29 per cent 



TiO^ 4-60 — 



AU^O^ 10-91 — 



Fe^O^ 7-5Ô — 



FeO 5-52 — 



MnO 0-23 — 



CaO 13-48 — 



MgO 9-29 — 



K^O 1-40 - 



Na^O 3-42 — 



H^O^) 3-65 — 



Further loss at ignition (Probably CO^) 3-85 — 



100-19 per cent 

 Microscopically this rock corresponds closely to the one 

 already described by Вас к s trom. The phenocrysts consist of 

 a dark-brown, strongly pleochroitic mica, which was not closely 

 examined, and may be partly an anomite, and also brownish 

 pyroxene, the extinction on (010) being about 38°, absorption 

 colour II a brownish, || Ь yellowish-green. At times a contrast 

 can be noticed between a light core and a darker outer border. 

 In contrast to these larger individuals we see a ground-mass 

 consisting of stalk-like pyroxene, abundance of ore and also 

 apatite; furthermore a not insignificant quantity of calcite, 

 sometimes occurring with primary appearance, but usually pseu- 

 domorphically replacing some other mineral ; finally there is a 

 compact, brownish, almost isotropic mass, which may very well 

 be rich in nepheline, though no proof of it can be adduced. 

 By cold diluted hydrochloric acid it is only slowly decomposed. 

 Olivine seems to be lacking in the slide examined; melilite has 

 not been proved to be present, though it by no means follows 

 that it could not be met with in fresh parts of the rock; a few 

 almost opaque crystal individuals might possibly be perowskile. 



^) Determined according to Penfield's method. 



