266 PHYSIOGRAPHY. 



Wavellite Websterite. 



Cleavage, parallel with M and the longer diagonal of the 

 base, perfect. Implanted globules ; composition columnar. 

 Surface drusy. 



Lustre of the faces of cleavage intermediate between 

 pearly and vitreous. Color white, passing into several 

 shades of green, blue, yellow, brown and black. Translu- 

 cent. 



Hardness=3'5 . . .4-0. Sp. gr. 2-337, of the variety 

 from Barnstaple. 



1. Before the blowpipe it loses its lustre and transparency, but does 

 not melt. With boracic acid and iron wire, it yields a globule of phos- 



phuret of iron. 



2. Analysis. 



By BERZELIUS. By FTJCHS. By STEINMANJV. 



var. Kakoxene. 

 Alumina 35-35 . 37-20 . . . 10 01 



Phosphoric acid 33-40 . 35-12 . . . 17-86 



Fluoric acid 2-06 . 0-00 . . . 0-00 



Lime 0-50 . 0-00 . . . 0-15 



Ox. of iron and mang. 0-00 . 0-00 Peroxide of iron 36-82 

 Silica 0-00 . 00 ... 890 



Water 28-00 . 28-00 With fluoric acid 25 95 



3. It occurs at Barnstaple in Devonshire, in small veins in clay slate ; 

 at St. Austle in Cornwall, in veins traversing granite, accompanied by 

 Fluor, Tin-Ore, Yellow Copper Pyrites, &c. ; in (he Shiant isles in Scot- 

 land ; at Zbirow near Beraun in Bohemia, in a kind of sandstone or grit; 

 at Arnberg in the Upper Palatinate, with Limonite ; and in handsome 

 bluish green varieties near Cork in Ireland, and in Brazil. The variety 

 called Kakoxene, of an ochre-yellow color from Bohemia, has, accord- 

 ing to BREITHAUPT, a sp. gr. =3 38, or rather less. It appears, how- 

 ever, to belong lo Wavellite, though a large intermixture of decomposed 

 Limonite, or Iron-Ochre, tends to disguise its properties. 



WEBSTERITE. 



Reniform, massive : composiiion impalpable. Surface 

 dull. Fracture fine grained and earthy. Friable. 



