334 FELSPAR 



Our recent Imports have been as follow : 



FEATHER AXiUIVX or Hair-Salt. A hydrous sulphate of alumina, result- 

 ing from volcanic action, and from the decomposition of iron pyrites, especially in the 

 coal-measure shales. See ALUM. 



FEATHER ORE, Plumositc, or Heteromorphite. A sulphide of antimony and 

 lead, allied to Jamcsonite. Its composition is, sulphur 19*2, antimony 31 P 0, lead 49'8. 

 It is sometimes found in capillary forms and like a cobweb, but it is also found 

 massive. 



FECUIiA (Fectde, Fr. ; Stdrkmehl, Ger.) sometimes signifies corn-flour, sometimes 

 starch, from whatever source obtained ; and it is also applied to chlorophyll, the green 

 matter of plants. The term is applied to any pulverulent matter obtained from plants 

 by simply breaking down the texttire, washing with water, and subsidence. 



FEEDER, a mining term. A small lateral lode falling into the main lode or 

 mineral vein. 



FEX.Ii. The hide of an animal. 



FELL MONGER. The business of the fell-monger is to separate the wool from 

 the skin. The wool is sold to the wool-stapler, and the stripped skins sent to the 

 leather-dressers or parchment-makers. 



FEZiSZTE or FELSTONE. A. compact rock, composed mainly of felspar, with 

 more- or less quartz. It has been shown that most felsites contain the elements of 

 granite in a compact instead of a crystalline form. See FKLSPATHKT ROCKS. 



FELSPAR or FELDSPAR (Fcldspath, Fr. and Ger.) Under the namo of 

 feltpar, the mineralogist associates a number of important rock-forming minerals, 

 which, from the many characters they possess in common, were formerly confounded 

 together, ;ind are with difficulty distinguished from one another by mere inspection ; 

 but which, nevertheless, are sufficiently distinct, both in chemical composition, and in 



