30 



fragments and two entire, small, translucent crystals. From the 

 angular values found by him and stated to be fairly accurate an 

 axial ratio is calculated which deviates not a little from the 

 one proposed by Bunsen (and Des Cloizeaux). 



A related mineral from Ovre Arö in the Langesundfjord, 

 Norway, was investigated by Brögger^). The material for in- 

 vestigation was, however, so scanty and so intimately mixed 

 with another mineral (Weibyeïte), that no analysis of it could 

 be made. Neither could the cryslallographic examination of 

 it give a decisive result, as no forms occurred other than a 

 hexagonal prism together with the base. But its optical and 

 other physical characters agree with those of the parisite. As, 

 therefore , this mineral cannot be Avith certainty regarded as 

 parisite and as, further, the two varieties, hamartite^) from 

 the Bastnås mine, Riddarhyttan , Sweden, and Kyschtym- 

 parisite^) from a locality in the Ural mountains, are also 

 too imperfectly knoAvn to be recognized as true parisite, the 

 Muso valley was the only certain locality of this mineral, until 

 G. Nordenskiöld *) found it in the »Lützen Collection» °). 



The material from Greenland that G. Nordenskiöld had 

 at his disposal , was very scanty. For the analysis only 

 0,0966 gr. could be used, and the crystals on which he 

 made the measurements of the angles , were very small and 

 by no means of the best development. The result of his 

 investigation, however, was to show that the Greenland mineral 

 was really parisite. But while the South-American mineral is 

 known only in the form of holohedral hexagonal crystals, 

 Nordenskiöld found the Greenland mineral to be trigonal. 

 The angular values obtained by him agree tolerably well with 



») Zeitschr. f. Kryst. 1890, Vol.16, p. 650. 



2) Öfvers. К. Vet. Ak. Handl. Vol. 25, p. 399. 



3) Bull. Ac. St. Pet. Tome 4, p. 401. 



*) Geol. Foren. Förh. 1894. Vol. 16, p. 338. 



■') A collection of minerals from Narsarsuk partly described by the author 

 in Zeitschrift f. Krypt. Vol.23, 1864, pag. 344. 



