ORDER VII. PRISMATIC ANDALUSITE. 93 



present species, that it is impossible to say whether it is 

 really different from the preceding one, since the characters 

 taken from hardness and specific gravity, and others very 

 nearly agree. The chemical composition has been found to 

 be almost exactly the same. R. BHANDES obtained 



Phosphoric Acid 43-32. 



Silica 6*50. 



Alumina 34*50. 



Magnesia 13-56. 



Lime 0-48. 



Protoxide of Iron 0-80. 



Water 0-50. 



Before the blowpipe it loses its colour, but does not melt. 

 It is slowly and difficultly dissolved in borax. With bora- 

 cic acid and iron-wire it yields a globule of phosphuret of iron. 



2. Prismatoidal Azure-spar occurs in masses, sometimes 

 pretty considerable, also in large indistinct crystals im- 

 bedded in rhombohedral Quartz, and mixed with Mica. 

 It has not been found in its original repositories, which 

 seem to be beds. 



3. It occurs in the valley of Freschnitz near Krieglach 

 on the Miirz in Upper Stiria. Boulders of the rock con- 

 taining the blue mineral are found also at Therenberg on 

 the foot of the Wechsel mountain in Lower Austria. 



II. GEM. 



GENUS I. ANDALUSITE. 

 1. PRISMATIC ANDALUSITE. 



Prismatic Andalusite, first subsp. JAM. Syst Vol. I. p. 

 68. Man. p. 181. Andalusite. PHILL. p. 108. An- 

 dalusit. WERN. Hoffm. H. B. II. 1. S. 291. Anda- 

 lusit. HAUSM. II. S. 506. Andalusit. LEONH. S. 475. 

 Feld-Spath apyre. HAUY. Traite', T. IV. p. 362. 

 Tabl. comp. p. 60. Trait^, 2de Ed. T. IV. p. 486, 



