276 PEKTOLITH. 



Potash . . . . . 2-84 

 Magnesia . . . .2-09 

 Lime 0-71 



100-08 

 Locality. Poorliouse Quarry, Chester co., 

 Pennsylvania. 

 Pektolith, v. Kohell. See Pectolite. 

 Pele's Hair. Lava blown by the wind, 

 when in a very fluid state, into hair-like 

 fibres. It is called by the natives of Ha- 

 waii Pele^s Hair, after the principal goddess 

 of the volcano of Kilauea. In chemical 

 composition it closely resembles Augite. 

 The following analysis is given by Dana : 



Silica 39-74 



Alumina . . . . 10'55 

 Protoxide of iron . .22-29 

 Lime ..... 2-74 

 Magnesia .... 2-40 

 Soda 21-62 



99-34 



Dana describes the mode of formation of 

 this substance from actual observation, as 

 follows : — " It covered thickly the surface 

 to leeward, and lay like mown grass, its 

 threads being parallel and pointing away 

 from the pool (of melted lava). On watch- 

 ing the operation a moment, it was apparent 

 that it proceeded from the jets of liquid 

 lava thrown up by the process of boiling. 

 The currents of air blowing across these 

 jets bore off small points and drew out a 

 glassy fibre, such as is produced in the com- 

 mon mode of working glass. The delicate 

 fibre floated (m till the heavier end brought 

 it down, and then the wind carried over the 

 lighter capillary extremity. Each fibre was 

 usually ballasted with the small knob which 

 was borne off from the lava-jet by the 

 winds," — Geology of the United States'' 

 Exploring Expedition, 1828-42, p. 179. 



Locality. Kilauea, Island of Hawaii. 

 Also in Iceland. 



The modern lava and volcanic glass of 

 Kilauea are composed of silica, protoxide of 

 iron, alumina, soda, potash, and lime, but 

 these vary much in their relative propor- 

 tions. They contain a large amount of 

 oxide of iron. Professor Silliman, jun., 

 asserts that soda is present to the exclusion 

 of potash ; but this is not borne out by Mr. 

 Peabody's analysis of Pele's Hair, in which 

 both potash and soda are given. 



M. P. G. Upper Gallery, Wall-case 1, 

 Nos. 20, 20a. 



Pelicanite, Ouchakow. A product of 

 the decomposition of Felspar, and related to 



PENNINE. 



Cimolite or Steiermark, and other minerals 

 of the same kind. Colour pale greenish. 

 Translucent at the edges. Amorphous. 

 Fracture conchoidal. H. 3-5. S.G. 2-256. 



Comp. _ Al Si5 + 2H, or Cimolite + H. 



Analysis, by Ouchaikow ; 



Silica 58-90 



Alumina .... 20-49 

 Peroxide of iron . . .0*39 



Lime trace 



Magnesia . . . .0-50 



Potash 0-29 



Phosphoric acid . . . 0-16 

 Water ..... 8-35 

 Quartz 10-33 



99-41 

 In a matrass gives water. 

 BB burns white, but does not fuse even 

 at the edges. With cobalt turns dark blue. 

 Insoluble in muriatic acid. 

 Locality. The government of Kiew in 

 Russia, as the base of a granitic rock. 



Peliom. The name sometimes given to 

 lolite from Bodenmais in Bavaria; from 

 !T£X;o?, smoky-hlue, in allusion to its colour. 

 Analysis, by Stromeyer ; 



Silica 48-35 



Alumina . . . . 31*71 

 Magnesia .... 10-16 

 Protoxide of manganese . 0*33 

 Protoxide of iron . . . 8-32 

 Water 0-59 



99-46 



Brit. Mus., Case 36. 



M. P. G. Upper Gallery, Wall-case 1, 

 No. 20. ^ 



Pelokonite (from •rM?, ash-coloured, 

 and y^ovi?, powder'). A variety of Cupreous 

 Manganese, found associated with Chryso- 

 colla, in Chili. H. 3. S.G. 2-5 to 2-6. 



Pencatite. The name given by Roth to 

 a variety of Predazzite. It is, however, a 

 doubtful species. 



Comp. CaC + MgH. 



Analysis, by Roth : 



Carbonic acid . . . 27*45 



Lime 33-53 



Magnesia . . . .23-27 

 Alumina and peroxide of iron 2-88 



Silica 3-28 



Water 10 26 



100-67 

 Locality. Predazzo, in the Southern Tyi'ol. 

 Pennine. A species of Chlorite, occur- 

 ring in acute rhombohedrons, truncated at 



