seated. Some systematic writers have confounded it with 

 rubelhte, with which it has scarcely two characters in 

 common. 



1.1 . . i . 

 .. :,;,;i j. CHEMICAL CHARACTERS. 



Without addition, or even with phosphoric salts, it is 

 infusible by the heat of the common blow-pipe; with bo- 

 rax or alkali, it affords a hyacinth red transparent glass; 

 with the heat excited by pure air, it gives a milk white 

 bead, and suffers a considerable loss of weight. It is in- 

 soluble in the mineral acids, before it has been melted 

 with alkali, but yields readily to acid of sugar; is preci- 

 pitable by acid of galls with a bright red, and by prus- 

 sian alkali with an handsome dark green colour. The 

 method of analj'sis I shall omit, as belonging properly to 

 mineralogicai chemistry; the result has shewn that this 

 fossil consists Avholly of the calx of Menac, 



GEOGRAPHIC DISTRIBUTION. 



This fossil has' hitherto been discovered in but few 

 places, and in moderate quantity, principally near Rose- 

 nau in Upper Hungary; in Mount St. Gothard in Swit- 

 zerland; in Fischthal in the high mountains of Saltzburg; 

 near St. Yrieux in France; in the province of Burgos in 

 Spain; in the forest of Speysart, near Aschaffenberg, in 

 Franconia; at Beresooskoi in Siberia, and Olapian in Tran- 

 -silvania. 



GEOGNOSTIC 



