878 Revieivs — Arsenic and Antimony Ores. 



masses in the felspar, often intergrown with columbite, mica, or 

 apatite. Many of the crystals are unusually large ; one crystal 

 fragment weighed 500 grams, and a solid mass of 1"5 kilos was 

 found ; an average of three analyses gave 9'95 per cent Th02. 

 Columbite builds fan-shaped aggregates in the felspar ; the crystals 

 are always singly terminated and often very large ; one weighed 

 over 6 kilos. 



Special Reports on the Mineral Resources op Great Britain. 



Vol. XV : Arsenic and Antimony Ores. By H. Dewey, with 



contributions by Dr. J. S. Flett and G. V. Wilson. Memoirs 



of the Geological Survey, pp. iv -f 59, with 2 figures and 



1 plate. 1920. Price 3s. net. 



rpHIS, the fifteenth volume of this valuable series, gives a com- 



-"- prehensive review of the British resources of ores of arsenic 



and antimony. The ores of arsenic have not been found in notable 



quantity in Britain outside Cornwall and Devon, but there the output 



is large, mainly as a by-product in the treatment of ores for tin and 



tungsten. Of late years the total production has averaged about 



2,500 tons per annum of crude and refined arsenic, which is mainly 



used in the preparation of insecticides and to a less extent in glass - 



making ; it is also employed in calico-printing, for hardening lead 



shot, and in medicine. All the arsenic is derived from mispickel. 



An interesting account is given of the mines where arsenic is or has 

 been produced in Cornwall and Devon, including a useful diagram, 

 not, however, quite complete, of the lodes in East Pool Mine. 



The production of antimony from the British mines is almost 

 negligible in amount ; the Glendinning Mine, in Dumfriesshire, here 

 described by Mr. G. V. Wilson, has yielded a few tons. Dr. Flett 

 gives an account of the antimony-bearing veins of the Knipes Mine, 

 near New Cumnock, in Ayrshire, which carry stibnite in uncertain 

 quantity. In Cornwall the antimony-bearing minerals jamesonite, 

 bournonite, and tetrahedrite occur in small quantity, but these, as 

 well as stibnite, are there mainlv mineralogical curiosities. 



