ORDER TI. PYRAMIDAL FELD-SPAli. 65 



Char of Comb. Pyramidal. Frequently single faces 

 are irregularly enlarged at the expence of the rest.* 

 Combinations. 1. P. P + CD. [P -f oo], Sim. 

 Fig. 101. Akudlek, Greenland. 



2. P 1. P. P + oo. [P -f cc]. Sim. Fig. 

 102. Pargas, Finland. 



3. P 1. P. (P) 3 . P + QD. [P + oo]. Sim. 

 Vol. I. Fig. 67. Vesuvius. 



4. P. (P) 5 . P -f QD. [P -f oo]. (P + oo) 5 . 

 Vesuvius. 



Cleavage, P -j- oo and [P -}- oo], distinct, but in- 

 terrupted ; traces of P oc, generally small 

 conchoidal fracture in that direction. Fracture 

 imperfect conchoidal, uneven. Surface of the 

 prisms sometimes longitudinally streaked, but 

 generally of nearly the same physical quality. 



Lustre vitreous, inclining to resinous upon the 

 cleavage, and fracture parallel to P oo, in- 

 clining to pearly upon P -j- Oo and [P + OD]. 

 Colour, various shades of white, grey, and green. 

 Red colours seem to arise from impurities. Streak 

 greyish-white. Transparent ... translucent on 

 the edges ; the red varieties are opake. 



Brittle. Hardness = 5-0 ... 5-5. Sp. Gr. =2-612, 

 Meionite ; = 2-726, white crystallised Scapolite 

 from Finland. 



* A crystal of the Scapolite, from Pargas, in the possession 

 of Mr NORDEXSKIOLD, presents at one extremity only the 

 alternating faces of (P) 3 , while the rest have disappeared. 

 The opposite extremity could not be observed. H. 



