34 PHYSIOGRAPHY. 



Apatite. 



ly formed by exposing a mixture of phosphoric acid and sulphate of lime 

 to a high temperature. It exhibits a lamellar texture, and shows by heat 

 on opposite ends, opposite kinds of electricity, a property not hitherto 

 observed in the natural crystals of Apatite. 



3. Analysis. 



By KL.APROTH. By VAUQUELIN, By PELLETIER & 

 from Spain. DojvADEi,fr. Spain. 



Lime 55-0 . 54-28 . 59-0 



Phosphoric acid 45-0 45-72 . 34-0 



Carbonic acid . .1-0 



Muriatic acid , . 0-5 



Fluoric acid . . 2-5 



Silica . .2-0 



Iron . .1-0 



4. There are examples of Apatite entering as an occasional admixture 

 into the composition of rocks, as granite and limestone. But it more fre- 

 quently appears iji beds and veins, consisting chiefly of ores of iron and 

 tin, or of crystallized varieties of those species of which the rocks them- 

 selves are composed. The crystallized variety, called Asparagus-stone 

 from Spain, is found in an ancient volcanic rock, along with Specular 

 Iron and compact Calcareous-spar. The compound varieties, called 

 Phosphorite, of the same country, form particular beds. 



5. Ehrenfriedersdorf in Saxony, Schlackenwald in Bohemia, the Grei- 

 ner mountain in Salzburg, Cabo de Gata in Spain, Devonshire and Corn- 

 wall, are some of the most distinguished localities of this species. Aren- 

 dal in Norway affords the bluish green and reddish brown crystals, 



t^Moroxite} ; St. Gothard in Switzerland, and Heiligenbluter Tauern in 

 Salzburg, furnish remarkable white, transparent crystals ; and Estrema- 

 dura in Spain, and Schlackenwalk in Bohemia, produce massive varie- 

 ties, while a pulverulent variety is found at Marmarosch in Hungary. 

 Small yellow r crystals occur at Partridge Island in Nova Scotia. 



Apatite has been found in many places in the United States ; but we 

 possess but one locality which affords it in any considerable quantity, or 

 in well crystallized specimens, and this is at Governeur, St. Lawrence 

 Co. (N.Y.) where it occurs crystallized in granular limestone, the crys- 

 tals being very abundant, large, (sometimes 4 or 6 inches in length,) well 

 defined, having the form of fig. 35, (except r,) and possessing a rich sea- 

 green or mountain-green color. Crystals several inches long, of the prima- 

 ry form have been obtained at Amity, (N.Y<) where it occurs of a green 



