PHYSIOGRAPHY. 73 



Blue Malachite. 



2. It is found in the salt mines oi'Jschel in Lower Austria. 



3. The foregoing description is too inadequate to pronounce upon the 

 pecific character of Bloedite. If it shall prove to be a new species, it 

 vill probably take its systematic place within the genus Glauber-Salt. 



4. Under this mineral must be included the Sulphate of soda and 

 nagnesia of Schemnitz, which occurs in little crystalline fibres or 

 leedles, that appear to be rhombic prisms. It is not efflorescent like 

 he Glauber-Salt. 



According to BEUDANT, it contains 



Sulphuric acid .... 44-7 

 Soda . A . . . 17-6 



Magnesia .... 11-4 



Water .... 25-4 



Earthy matter . . . . 09 



5. The Reussine of KARSTEN may also be introduced here, until 

 omething further is determined respecting its properties. It occurs in 

 ix-sided acicular crystals, which probably come from a rhombic prism : 

 .Iso in flakes. Fracture conchoidal. Taste bitter, astringent. It con- 

 ists of 



Sulphate of soda . . . 66-04 



Sulphate of magnesia . . . 31-35 

 Sulphate of lime . . . 0-42 



Chloride of magnesium . . 2-19 



According to BEUDANT, the Reussine is a mixed mineral, consisting 



f effloresced Glauber-Salt and small crystalline particles of the double 



alt of sulphate of soda and magnesia. 



BLUE MALACHITE. Azure C oppe r-Bary te. 



Primary form. Oblique rhombic prism. M on M' = 

 )8 50'. 



Secondary forms. 



1. Primary form. 2. Primary form, having the obtuse 

 erminal edges replaced by single planes, (fig. 95. P. I.) 

 *. Primary form, having both the obtuse and acute termi- 

 lal edges replaced by single planes. 4. Form 2d, with 

 he oblique edges of the prisms replaced by tangent planes. 

 >. Form 2d, with the lateral solid angles replaced by sin- 



7 > 



