398 



Transactions. — Geology. 



1. 



2. 



3. 



. . 40-20 



41-20 



45-91 



.. 12-10 



12-10 



1-67 



traces 



traces 



5-63 



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• • )> 



>> 



t) 



. . 33-20 



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35-07 



12-70 



12-74 



12-67 



4 - 5; sp. gr. 2-592. Is completely decomposed by hydrochloric acid. In blow- 

 pipe flame infusible, turns faint buff colour, no distinct soda reaction, but 

 slight reaction of manganese with the proper fluxes." 



Analysis. 



Silica . . 



Protoxide of 



Alumina 



Manganese 



Chromium 



Magnesia 



Water of constitution 



98-20 100-06 100-95 



This is alluded to by Prof. Liversidge (Trans. N.Z. Inst., vol. x., p. 497) 

 as marmolite. 



There is also a specimen in the collection of the Colonial Museum, from 

 Jackson's Bay, which is of a grass-green colour, translucent and laminated. 



Antigorite. — The occurrence of this mineral at the Dun Mountain is 

 mentioned by the late Mr. E. H. Davis (Geol. Eep., 1870-71, p. 112). 



Hectorite occurs at the Dun Mountain, Nelson (for description see below, 

 Art. xlviii.). 



Picrolite, a coarsely fibrous, variety, of dark dirty green colour, occurs at 

 the Dun Mountain. 



Chrysolite occurs as thin veins of a silky texture and pale green colour 

 traversing the dark green serpentine of the Dun Mountain. 



Picrosmine, 2 Mg Si + H. — A massive sectile variety of this mineral, of 

 a greenish-grey colour, occurs associated with chromite at the Dun Moun- 

 tain ; it is also found as a network of veins, in which crystals of bronzite 

 occur, in the same district. 



Schiller Sjjar, Mg (Fe, Ca), Si {-My i^ £e) + H.— The occurrence of 

 this mineral with pyrites on the West Coast is mentioned by Dr. Hector 

 (Jurors' Eep. N.Z. Ex., 1865, p. 266). 



Chlorite, 2 E Si + E 2 -Al + 3 H, occurs as a constituent of the chlorite 

 schists, which are found in many localities between Otago and Nelson on 

 the West Coast side of the South Island. It is mentioned by Dr. Hector 

 (Jurors' Eep. N.Z. Ex., 1865, pp. 266, 437) in the schist of the West Coast, 

 and also as an amorphous form in the vesicular basalts of Otago Heads and 

 elsewhere ; by Dr. v. Haast in laminae in the metamorphic schists of 

 the West Coast, (Jurors' Eep. N.Z. Ex., 1865, p. 257) ; by Mr. Skey, at 

 Tararu Creek, Thames (Geol. Eep., 1870-71, p. 88) ; by myself in chlorite 

 schists at the Fox Glacier, Westland (Geol. Eep., 1874-76, p. 73) ; and by 

 Professor Liversidge, from Deep Creek, Kakapo Lake (Trans. N.Z. Inst., 

 vol. x., p. 497). 



