OllDEH VI. PYRAMIDAL FELD-SPAB. 267 



polite is founded. Among the varieties of the latter, there 

 are some crystals, long and acicular and their composition 

 columnar, possessing light shades of colour ; others which 

 are short and thick, granularly compound, and of darker 

 shades of colour. These two kinds have been distinguished 

 by the names of radiated and foliated Scapolite. Dlpyie 

 has been united with the present species, in reliance on 

 those characters, which are quoted in most mineralogictl 

 works ; it seems to differ from the preceding ones scarcely 

 in any thing but in its reddish-white colour, and thin co- 

 lumnar composition in massive varieties. Mr BROOKE, 

 however, quotes a very minute crystal in his possession, 

 too imperfect to be determined by measurement, but whose 

 form he supposes to be the regular hexagonal prism, as it 

 was first described by HAUY, and afterwards abandoned in 

 consequence of renewed observations. 



3. The following results were obtained, 1. by STROJIEYER, 

 from a variety of Meionite from Monte Somma ; and 2. 

 by NORDEXSKIOLD, from the Scapolite from Pargas. 



Silica 1. 40-531. 2. 43-83. 



Alumina 32-726. 35-43. 



Lime 24-245. 18-96. 



Potash and a little Soda 1-812. 0-00. 



Protoxide of Iron 0-182. 0-00. 



Water 0-000. 1-03. 



In a strong heat of the blowpipe, Scapolite melts into a 

 vesicular glass, and intumesces considerably ; then it as- 

 sumes the appearance of ice, and does not melt any longer. 

 It is dissolved by borax with effervescence, and melts with 

 it into a clear globule. Dipyre yields almost the same re- 

 sults. 



3. Meionite is met with among the minerals ejected by 

 Mount Vesuvius, along with rhombohedral and prismatic 

 Feld-spar, pyramidal Garnet, rhombohedral Talc-mica, &c. 

 The varieties of Scapolite occur in primitive mountains, 

 as in the beds of octahedral Iron-ore at Arendal in Norway, 

 and in Wermeland in Sweden ; and are generally accompa- 



