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the solidification of the rock; with phenocrysts of altered biotite 

 and also large green individuals that are secondary either after 

 amphibole or pyroxene, and with a compact ground-mass per- 

 foliated with calcite, chlorite and fine micaceous scales. 



A somewhat dissimilar appearance is presented by two 

 other varieties of rock. Of large felspar crystals only plagio- 

 clase occurs; then we find a light-coloured serpentinized mineral, 

 surrounded by dark grains of iron-ore, which mineral either 

 represents an old rhombic pyroxene or possibly sprang from 

 an amphibole mineral; in one of the rocks biolite is also 

 present. We may also mention pseudomorphs which now al- 

 most entirely consist of carbonate. In addition to this, the 

 rock is altogether traversed by irregular, amygdaloid, light-green 

 secretions which seem to consist of serpentine and some thin 

 needles (zeolite?). The .ground-mass is extremely compact and 

 strongly altered, but it looks as if it had originally been formed 

 of large sections which possibly consisted of intimately inter- 

 grown individuals. 



Furthermore, we must mention a greenish basic rock, 

 which is interesting because the felspar or any corresponding- 

 mineral is almost completely absent among the porphyritic cry- 

 stals. On the other hand it is rich in large biotite crystals, partly 

 transformed into chlorite, and also in green serpentinized masses 

 mostly devoid of regular crystal shape; I can express no opinion 

 about their origin. The ground-mass is closely perfoliated with 

 the same serpentinized substance; for the rest it is quite cry- 

 stalline and seems to consist mostly of a comparatively fresh 

 (new-formed?) felspar-mass. 



Lastly we can add to this series another, more divergent, 

 rock which in certain respects forms a transition to the group 

 following. It contains some large individuals of rounded hexa- 

 hedral form, which now consist of serpentine and a carbonate 

 mineral, but otherwise it consists mainly of biotite and lath- 

 shaped felspar; in addition to this quartz (secondary?) occurs as 



