4(56 LIST OF MINERALS, THEIR 



F 



Fahlore, see Copper, sulphuret, arsenical. 

 FAIILUNITE. Two substances differing in their external cha- 

 racters have passed under this name. The Triklasite, 

 analysed by Hisinger, agrees nearly in its external 

 character, and in its composition, with the Gieseckite. 

 The hard Fahlunite, which has been analysed by Stro- 

 meyer, may remain here as a separate species, unless 

 it be referred to Dichroite, to which Stromeyer appears 

 to think it belongs. 

 Fassaite, see Pyroxene. 

 FELSPAR; Orthose. 



crystallised, a doubly oblique prism, P on M, 90 ; 

 P on T, 120 15' ; M on T, 112 45', as measured 

 by W. P. 

 transparent, or translucent ; Adularia. 



with bluish opalescence ; Moon-stone. 

 glassy; Sanidin. 

 opaque. 



common, 

 blue. 



green; Amazon stone, 

 variously opalescent ; Labrador felspar, 

 fetid; Necronite. 

 compact ; Amausite ; Felsite ; Felstein ; Hornstone, 



fusible ; Lemanite ; Lodalite ; Saussurite. 

 globular. Giving its peculiar character to the rock 

 called Napoleonite, and to another termed Variolite. 

 decomposd ; Kaolin. 

 Felstein, see Felspar, compact. 



FETTSTEIN; Elaeolite; Sodaite. Cleavage parallel to the 

 planes of a prism of 112 and 68, but no transverse 

 cleavage to determine the class to which the prism 

 belongs : measured by W. P. A red variety has been 

 called Lythrodes. 



blue, from Laurwig in Norway, see Glaucolite. 

 FIBROLITE. 



Figure-stone, see Agalmatolite. 

 Fiorite, see Quartz. 

 Fish-eye-stone, see Apophyllite. 

 Flint, see Quartz. 

 Flockenerz, see Lead, arseniate. 

 Flos-ferri, see Lime, Arragonite, coralloidal. 

 Fluor spar, see Lime, fluate. 

 Fossil copal, see Bitumen. 



