74 Mr. Haidinger on the Specific Gravity of Minerals. 



* 10. Scorodite, pale green, semi-transparent crystals, from 

 Stamirj Asser am Graul, Saxony, 3.162 



Order V. Mica. 



1. Vivianite, (phosphate of iron,) fragments of transparent 

 crystals, from St. Agnes, Cornwall, 2.661 



2. Cobalt-bloom, (arseuiate of cohalt,) red acicular crystals, per- 

 fectly cleavable, from Schneeberg, Saxony, 2.946 



3. Cobalt-bloom, showing red and green colours in the same 

 crystals, from Gotthold-stolln near Platten, Bohemia, 3.033 



4. Talc, apple-green laminae, from the Greiner mountain in 

 Salzburg, 2.744 



5. Chlorite, loose scaly particles of a dark green colour, earthy 

 chlorite of Werner, 2.706 



6. Chlorite, massive, composed of large granular individuals, 



dark green, from the Rothen Kopf mountain in Salzburg, 2.713 



7. Chlorite, of the same kind, only the individuals smaller, 2.729 



8. Chlorite, a similar variety, consisting of still smaller indi- 

 viduals, 2.731 



9. Chlorite in large laminae, and most perfectly cleavable, more 

 translucent, from the same locality, 2.775 



10. Chlorite, liver-brown rhombic prisms, imbedded in compact 

 green chlorite, from the same locality, 2.781 



11. Chlorite, composition almost impalpable, and fracture slaty, 



of a dark mountain-green colour, 2.799 



This variety contains minute crystals of rutile. 



12. Green-earth, a compact, celandine-green variety, from 

 Monte Baldo, near Verona, 2.834 



On account of the difficulty of obtaining it free from mecha- 

 nical admixtures, this specific gravity is perhaps not quite exact. 



13. Mica, perfectly cleavable individuals, engaged in granite, 

 showing iridescent fissures parallel to the laminae, colour oil-green 

 perpendicular to the axis, more brown parallel to it, from the 

 Schwamberg Alps in Stiria, 2.883 



It has two axes of double refraction, like the white mica from 

 Siberia. 



14. Mica, perfectly black, in a granular composition, exhibiting 

 a tendency to slaty structure, from the district of Pinzgau in Salz- 

 burg, 2.911 



15. Mica, silver-white crystals from Zinnwald, Saxony, 2.945 



16. Mica, greenish -black, in large perfectly cleavable individu- 

 als, Siberia, 2.949 



17. Lepidolite, peachblossom-red, compound of granular indi- 

 viduals, from Rosena, Moravia, 2.831 



18. Another specimen of the same, . 2.833 



19. Pearl-mica, perfectly cleavable, reddish-white crystals, 3.022 

 *20. Hydrate of magnesia, white laminae, perfectly cleavable 



and translucent, from Unst, 2.350 



(To be continued.) 



