a New Mineral Species. 263 



found them to be cubes, having their solid angles replaced by 

 eight faces, each of which was inclined about 125° to the 

 faces of the cube. As these crystals had a vitreous aspect, and 

 scratched glass, Hauy did not scruple to consider them as a 

 variety of Analcime.* In this opinion, he has been followed 

 by all succeeding writers on mineralogy, and when cubical 

 crystals of a flesh-red colour were discovered in Arthur Seat, 

 the same trivial name of sarcolite was used to designate that 

 acknowledged variety of Analcime. 



At Montecchio-Maggiore, and at Castel, in the Vicentine, 

 there was afterwards discovered another substance which 

 Hauy and other mineralogists have regarded as sarcolite. It 

 was of a flesh-red colour, and occurred in small rounded mas- 

 ses engaged in wacke. It accompanied white crystals of A- 

 nalcime, and though it had a less vitreous fracture than the 

 sarcolite of Thomson, yet, by Hatty's observations, it was found 

 to pass into the Analcime, assuming by degrees the vitreous 

 tissue of the latter. 



According to the analysis of Vauquelin, however, the flesh- 

 coloured crystals of the Vicentine contained less soda, and 

 more water, than Analcime, and although M. Leman had dis- 

 engaged from a mass of sarcolite from Castel some crystals 

 of the form of hexaedral prisms, terminated by hexaedral 

 pyramids, which Vauquelin considered to be the same as the 

 amorphous variety, yet Hauy and all succeeding writers on 

 mineralogy have still regarded these substances as Analcime.-f- 

 That the six-sided prisms of Leman could not possibly be 

 united to Analcime ought to have been very obvious ; but 

 their similarity in form, composition, hardness, and specific 

 gravity to Chabasie rendered it probable that they belonged to 

 that species. 



Mr Allan, whose cabinet has enriched mineralogy with so 

 many new species, had the good fortune to pick up in the 

 Little Deer Park of Glenarm, in the county of Antrim, a spe- 

 cimen, containing two or three fine crystals of a whitish as- 

 pect, resembling the six-sided prisms of Leman, and which 



* Traile, 2d Edit. Tom. III. p. 177, 179. 



t De Dree, in his Catalogue des lluil Collections, p. 18, designates the 



ni) tancc analysed by Vauquu'in by the name of Hydrolite, a name given 



by Sir George Mackenzie to the Stalactitlcal Opal produced by hot springs. 



