170 PHYSIOGRAPHY. 



Implanted globules ; composition thin columnar. 



Surface drusy. 

 Lustre of the faces of cleavage intermediate between 



pearly and vitreous. Colour white, passing into 



several shades of green, grey, brown, and black. 



Translucent. 

 Hardness = 3-5 ... 4-0. Sp. Gr. = 2-337, of the 



variety from Barnstaple. 



Before the blowpipe it loses its lustre and transparency, 

 but does not melt. With boracic acid and iron wire, it 

 yields a globule of phosphuret of iron. It consists, accord- 

 ing to FUCHS and BERZELIUS, of 



Alumina 37'20 35-35. 



Phosphoric Acid 35-12 33-40. 



Fluoric Acid 0-00 2-06. 



Lime 0-00 0-50. 



Oxide of Iron and Manganese 0-00 1-25. 



Water 28-00 26-80. 



It occurs at Barnstaple in Devonshire, in small veins in 

 clay-slate ; at St Austle in Cornwall, in veins traversing 

 granite, accompanied by octahedral Fluor-haloide, pyrami- 

 dal Tin-ore, pyramidal Copper-pyrites, &c. ; in the Shiant 

 isles in Scotland ; at Zbirow near Beraun in Bohemia, in 

 a kind of sandstone; at Amberg in the Upper Palatinate, 

 with prismatic Iron-ore, &c. ; in fine varieties near Cork in 

 Ireland, and in Brazil. 



WITHAMITE. 



AUGITE-SPAR. 



Withamite. BREWSTER. Edin. Journ. of Science. Vol. II. 

 p. 218. 



Hemi-prismatic. Minute crystals observed similar 

 to Fig. 75, lengthened between M and T 9 aggre- 



