Mineralogy. 



1T9 



Wollaston. Colour white. Transparent. Index of refraction = 1.47. Mr. 

 Levy had remarked this substance in minute crystals, accompanying the 

 wavellite from Cornwall. Dr. Wollaston examined it at his request, 

 and found it to be a compound of alumina and fluoric acid, in reference 

 to which he suggested the name of Fluellite. His comparative exami- 

 natien of the refractive power of wavellite, gave for the index of the 

 latter 1.52. (Annals of Philosopfiy , Oct. 1824, p. 241.) 



29. Analyses of several native Carbonates of Lime, Magnesia, Iron, and 

 Manganese, by M- P- Berthier. 



No. 



Lime. 



Mag- 

 nesia. 



Protoxide 

 of Iron. 



Protoxide of 

 Manganese. 



Clay or Quartz 



Carbonic Acid 

 and Water. 



1 



8 



3 

 4 

 5 

 S 



7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 



23 



24 



50.0 

 46.8 

 34.8 

 30.0 

 21 8 

 53.8 

 29.0 

 26.6 

 37.4 

 35.2 

 34.5 

 31.4 

 29.7 

 28.6 



1.7 

 11.0 

 5.0 

 4.0 

 14.0 

 5.4 

 5.0 



3.9 



6.2 



17.2 



21.0 



16.0 



11.0 



1.0 



5.6 



6.8 



7.2 



2.0 



16.2 



15.4 



12.2 



2.3 



0.7 



1.2 



2.0 



0.8 



23.0 



0.8 



0.5 



1.4 



2.0 



11.0 



9.0 



5.0 



10.6 



5.6 



8.3 



8.5 



5.0 



42.8 



45.2 



43.0 



50.5 



34.0 



43.6 



51.5 



4.5 



0.7 



7.6 

 5.0 

 4.0 

 9.2 

 1.6 

 3.5 

 2.2 



0.6 

 11 

 8.0 

 36 

 6.0 



56.0 

 51.0 



5.0 

 2.8 

 0.6 

 2.4 

 22.8 



6.9 

 22.6 

 146 



1.4 



2.3 



0.4 



4.8 



5.7 

 1.0 

 7.0 

 9.1 



8.7 

 Silex & 

 Water 



[25.0 



41.1 

 44.2 

 46.6 

 46.6 

 36.4 

 42.9 

 42.1 

 34.6 

 37.4 

 43.2 

 43.5 

 37.7 

 44.3 



43.0 



Carbon. 7 . , .„ 



Acid. J41.8 

 40.4 

 38.0 

 38.1 

 32.7 

 34.3 

 35.0 

 36.0 

 38.6 

 38.7 



1. Compact dark-gray secondary limestone, from Ardennes. 



2. Freshwater limestone, from Quincy, near Me'lun. Resembling 

 chalk. 



3. Compact yellowish-gray secondary limestone, from Epinac. 



4. Dolomite, white, friable, and resembling sugar. 



5. Dolomite, from the Alps. 



6. Rose-coloured calcareous spar, and with the brown variety analysed. 

 No. 10, from Moutiers in Savoy, where it occurs along with the golden 

 titanium. Cleavable in large rhombohedrons, with faces of composition 

 parallel to R — 1. Spec. grav. =2.71. 



7. Compact gray secondary limestone, from the iron works of Ran- 

 cie, Arriege. 



8. Compact gray secondary limestone, forming the roof of the iron 

 ore at la Voulte, Ardeche. Spec. grav. = 2.68. 



