32 



ARRAGONITE, ETC. 



Upper 

 Galleey. 



Wall-case 40 



No. 11 flat, in the manner in which such stalagmites are 

 frequently formed, from the dropping of water containing 

 lime. 



12. 



(Jos-fi 



13.— Arragonite {polished). — Hfracombe, D 

 Presented by Thomas Reynolds. 



14. 



(flos-fi 



careous spar. — Alston Moor, Cumberland. 



15. — Medallion. Head of Jupiter, composed of car* 



f 



deposited in a mould, from water charged 



n 



charged with cal- 



with calcareous matter. The sprin 

 careous matter is made to descend from a height upon some 

 boughs of trees placed beneath, by which means it is 

 divided into a fine spray. The mould of which a copy i 3 

 required, or the other objects to be petrified, being placed 

 Where the spray will fall upon them, thus become gradually 

 covered with a calcareous deposit by the evaporation of the 

 water holding it in solution, and at length a cast of the 

 original is procured.— From the springs of San Filippo, near 



JRadicoft 

 16.—^ 



my. Presented by Dr. Radford. — H.W.B. 

 [Tic Arragonite {flos-fervi\ on clay slate. 

 von. Presented by T. Richardson. 

 d Arragonite { fl o s -fer ri) , on c 

 m. Presented by T. Richardson. 



Arragonite differs from calcareous spar in containing a 

 little strontia and water ; example from Brisgau 



Jlfracombe, D 



17. — Corallo 

 Ilfracombe, Dev 



Carbonate of lime - 

 Carbonate of strontia 

 Water - 



- 97-0963 



- 2-4609 



- 0-4102 



99-9674 



? 





i 



1! 



(0 



In 



coiuf 

 percc 



»gg lv 

 21 



in th 



22 



2 



boil 



Is 



mw. 



SltlOl 



Londi 



most 



calcar 

 24. 



hesti 

 calcar 



2o\. 



tree. 



26. 



" At Dufton, a silky, fibrous variety, called satin spar 

 (see 13 and 14), occurs traversing shale, in thin veins, 

 generally associated with pyrites. In Buckinghamshire, 

 Devonshire, &c. it occurs in stalactitic forms in caverns, and ™ e 



of snowy whiteness at Leadhills in Lanarkshire." — Dana's 

 "Mineralogy,'* 1854, vol. ii., p. 449. 



s 



