28S PHYSIOGRAPHY. CLASS II. 



been analysed by STROMEYER, another from Finland by 



ROSE ; they have yielded the following results : 



Silica 51-445 51-60. 



Lime 47-412 46.41. 



Protoxide of Iron 0-401 a trace. 



Oxide of Manganese 0-257 0-00. 



Water and loss by heating 0-076 0-00. 



Mechanical admixtures 0-00 I'll. 



Its chemical formula Ca 3 Si > agrees with 47'24 lime and 

 52*76 silica. Before the blowpipe it melts on the edges 

 into a semi-transparent colourless enamel. It requires a 

 strong heat for melting, and sometimes boils a little. It is 

 easily dissolved by borax, and in considerable quantity, and 

 forms with it a transparent globule. By fusing lime and 

 silica in the required proportions, cleavable masses of the 

 present species have been obtained, but not yet any crystals. 

 2. The oldest variety known of prismatic Augite-spar is 

 from Cziklowa near Orawitza, in the Bannat of Temeswar, 

 where it occurs in several copper mines. It is associated 

 with several ores of copper, also with rhombohedral Lime- 

 haloide, with pyramidal Kouphone-spar, &c. In Finland 

 it occurs in limestone, at Edinburgh, in the greenstone of 

 the Castle-hill; it is also found in several localities in 

 America, and with Essonite in Ceylon. The variety from 

 Capo di Bove near Home, first called Wollastonite, but 

 now supposed to be perhaps different from the present 

 species, occurs in lava resembling basalt, and is associated 

 with paratomous Augite-spar, trapezoidal Kouphone- 

 spar, &c. 



GENUS IX. AZURE-SPAR. 



1. DODECAHEDHAL AZUEE-SPAR. 



Azurestone or Lapis Lazuli. JAM. Syst. Vol. I. p. 39!). 

 Man. p. 317. Lapis Lazuli. PHIL L. p. 44. Lasur- 

 stein. WERN. Hoffm. H. B. II. 1. S. 276. Lasur- 



