454 Chronicles of Science. [July* 



Sella, the name of SeUaite has been appropriated to a new species 

 described by Striiver.* The mineral is apparently a ^simple fluoride 

 of magnesium, and crystallizes in small, transparent, prismatic 

 forms, embedded in the anhydiite of Montiers in Savoy. 



Associated with the cryohte of Ivigtok, in Greenland, a new 

 species has been found, and named after the locality. Ivigtite 

 appears to be a silicate of alumina, soda, and protoxide of iron, with 

 a little fluorine, t 



In a pecuHar variety of hyperite occurring in the parish of 

 Eura, in S. W. Finland, a mineral is met with, to which Herr Wiik 

 applies the name of Eurcdite.X Its composition aj)proaches that of 

 delessite. 



Professor Eeichardt has recently published analyses of the Poly- 

 halite which occurs in large nodular masses scattered through the 

 so-called " poly halite region " of the salt- deposits of Stasslurt, in 

 Prussian Saxony. § 



Picotiie is a mineral bearing close kindred to spinel, and found 

 in octohedral crystals in certain forms of ohvine rock. Dr. Petersen 

 has lately examined specimens from the Dun Mountain in New 

 Zealand, and is thus led to establish two types of the species — a 

 chrome-jncotite and an alumina-picotite. The Doctor has likewise 

 examined the magnetic pyrites of Auerbach, and regards its formula 

 as FeS instead of Fe7S,-, , as generally written. Finally, he pub- 

 lishes some analyses of red silver-ores, both " dark " and " light," 

 or in other words, both antimonial and arsenical. || 



10. MINING, METALLUEGY, AND THEIK EECENT 

 LITEEATUEE. 



Mining. 



In our last number we noticed the fact that the ancient Stannary 

 Court of Cornwall was about to undergo a change, a Bill having 

 been introduced for its amendment. Numerous alterations have 

 been made in the Bill since its first reading; it has been read the 

 second time ; and no doubt, before these pages are in the hands of 

 our readers, tlie Stannary Court Act will have become the law 

 of the future for the Stannaries of Cornwall and Devonshire. 



* Atti della Reale Accademica dclle Scicnzc di Torino. 



f Sdliinan's Journal, xlvi., p. 400. 



X Ofv. af Finska Vet. Soc. Fiirh. ISdD, xi., p. 28. 



§ Lconhard n. Broiin's Jalii])uc-h. ISO'.), Hoft 3, p. .325. 



II 'Journal fiir praktiaclie C'bcmic,' 1801), No. 3, pp. 134, 137, 141. 



