Cox. — On the Mineralogy of New Zealand. 403 



fuses easily, and with intumescence to a colourless transparent bead. 

 Easily decomposed by hydrochloric acid, with separation of gelatinous 



silica. 



Analysis. 

 Silica 



oiiiua . . . . . 



Iron . . 



. . 14-66 



Alumina 



11-47 



Lime 



22-93 



Magnesia 



2-13 



Water of constitution 



4-10 



100-00 



Kyanite (Disthene), j^l Si. — This mineral is mentioned in the Catalogue 

 of the Colonial Museum (p. 119) from Westland. The specimen is of a 

 beautiful cobalt blue colour, and associated with quartz. The crystals are 

 not very distinct. 



Chiastolite. — Crystals of this mineral, of a dirty-grey colour, imbedded 

 in clay slate, from Slate Kiver, Collingwood, are in the collection of the 

 Colonial Museum. 



Leucite, J^. Si 3 + K Si. — The occurrence of this mineral in leucitic 

 basalt is mentioned (Col. Mus. and Lab. Kep., x., p. 48) from Castle Point, 

 Napier, having been collected by Mr. A. McKay. 



Scajiolite, .^j. 2 Si 3 -f (Ca, Na) Si. — The occurrence of this mineral in a 

 massive form at the Dun Mountain is mentioned by Mr. E. H. Davis (Geol, 

 Kep., 1870-71, p. 112), and an impure form of the same mineral was 

 forwarded from the Maitai Valley, by the Nelson Museum, in 1868. The 

 specimens collected by Mr. E. H. Davis were analyzed at the Colonial 

 Laboratory, with the following results ; — 





(10 



(2.) 



(3.) 



Silica 



. . 48-63 



48-29 



43-06 



Lime 



. . 25-39 



26-59 



24-34 



Alumina 



\ 20-70 



20-47 



11-47 



Iron sesquioxides, with v 







manganese . . 



) traces 



traces 



7-24 



Magnesia 



2-93 



•85 



9-06 



Water 



2-35 



2-53 



3-42 



Loss 





1-27 



1-41 



100-00 100-00 100-00 



Nos. 1 and 2 are white minerals, with rare mottlings and stria? of a 

 dark red colour ; they are dull and opaque, but in thin sections translucent ; 

 easily fusible in the blowpipe, with intumescence to transparent beads, 

 giving faint reaction of soda. No. 3 has a general similarity to the others, 

 but is uncoloured, and fuses to a yellow-coloured bead in the blowpipe 



