fSt Mr Haidinger on Mesole. 



variety is white, slightly yellowish. It forms part of the in- 

 side of a geode detached from one of the vesicular cavities of 

 basalt. It is from Karartut, near Godhavn, in the island of 

 Difico. 



8. Large individuals aggregated, and coarsely forming reni- 

 form shapes. The surface is dark yellowish-grey ; the colour 

 on the cleavage planes almost straw-yellow; the whole ap- 

 parently decomposed. Cleavage is very easily obtained, and 

 the laminae show some elasticity when we attempt to separate 

 them. This specimen is a native of Nia Kornak in the Omen- 

 aksfiord, like the preceding in the island of Disco. 



The perfect single cleavage, with a considerable deal of 

 pearly lustre, at once distinguishes mesole from mesotype and 

 other similar bodies, with which it was sometimes confounded. 

 Its specific gravity being above 2.3, is much more consider- 

 able than that of either stilbite or heulandite, which hardly 

 ever exceed the limit of 2.2, an immense difference in species, 

 whose specific gravity is at the same time so inconsiderable 

 and so constant as in the genus Kouphone-spar. In this 

 property it nearly agrees with apophyllite, but is readily dis- 

 tinguished by the traces of its prismatic forms, which are al- 

 ways visible, while the forms can be likewise made out to be 

 pyramidal in the other species. Its crest or fan-like aggrega- 

 tions, the like of which never occur in apophyllite, yield also 

 a good empirical mark, which may assist us in ascertaining the 

 prismatic form of the species, although the crystals hitherto 

 observed are too small, or rather too thin, to allow of an exact 

 determination. In allusion to these aggregated groups, and 

 the kind of fracture depending upon it, I propose the Flabelli- 

 form Kauphone-spar as the systematic denomination of the 

 species, the first varieties of which were described by Berze- 

 lius under the name of Mesole. 



It is worth noticing, that this species, when it is associated 

 with stilbite or apophyllite, will always form the lowest stra- 

 tum immediately adjoining the basaltic or amygdaloidal sup- 

 port, in the cavities of which it is deposited. 



Beside Faroe and Disco, where mesole occurs in many 

 places, it is likewise found in Iceland and in Sweden. In the 

 former it occurs at Skagastrand, in the northern part of the 



