494 Transactions. — Geotoyy. 



Gypsum or Selenite. — Awamoko. 

 In thin roughly crystallized plates, raixed with hlack shaly matter. 



Gypsum.-'- — "White Island. 

 Associated with sulphur in thin columnar crystals somewhat inter- 

 lacing ; opaque white ; somewhat fibrous in structure. 



Gypsum. — Wakatipu. 

 A white, opaque, mammillated incrusting mass, from a cave at Mr. 

 Nicholas', Lake Wakatipu. 



Vivia7iite.j: 

 A small rolled nodule of a dull blue colour, and earthy appearance ; 

 breaks with a flat conchoidal fracture; hardness = 3; streak pale blue; 



almost entirely soluble iu acid. 



Analysis. 

 Hygroscopic moistui-e 3-017 or loss at 100° C. 



Combined water 

 Iron protoxide 



,, sesquioxide 

 Phosphoric acid 



21-425 by difference 



28-177\ 



16-363 I Soluble iu hydi'ochloric acid 



31-018J 



100-000 (Liversidge). 



Quartz. — Hendon. 

 White vein quartz, with clear transparent crystals on one surface made 

 up of the hexagonal prism combined with the pyramid, (co P, mP.) 



Quartz. — Milford Sound. 



Translucent white, much fissured, and in consequence almost granular 



in structure. 



Chalcedony. — Moeraki. 



Massive ; bluish-grey colour ; translucent, with small quartz crystals in 

 the cavities. 



Chalcedony. — Otepopo. 



Mammillated ; translucent ; grey with yellow patches. 



Agate. — Mount Charles, Otago. 



A mixture of grey chalcedony and quartz crystals stained with a little 



hydrated sesquioxide of iron. 



Flint. — Moeraki. 



Grey, with brown and dark blue-grey streaks, fissured ; conchoidal 



fracture ; pitted on the weathered surface, which is grey in colour. 



Chert. — Amuri Bluff. 

 Somewhat chalky appearance, exhibiting bluish and yellowish tints ; 

 white in parts. Hardness about 6*5. Effervesces with hydrochloric acid. 



* TrauB. N.Z. lust., in, 280. f Eep. N.Z. Exh., 1865, p. 436. 



