494 Transactions.—Geology. 
Gypsum or Selenite—Awamoko. 
In thin roughly crystallized plates, mixed with black shaly matter. 
Gypsum.*—White Island. 
Associated with sulphur in thin columnar crystals somewhat inter- 
lacing ; opaque white; somewhat fibrous in structure. 
Gypsum.—W akatipu. 
A white, opaque, mammillated incrusting mass, from a cave at Mr. 
Nicholas’, Lake Wakatipu. 
Vivianite.t : 
A small rolled nodule of a dull blue colour, and earthy appearance; 
breaks with a flat conchoidal fracture; hardness=8; streak pale blue; 
almost entirely soluble in acid. 
Analysis. 
Hygroscopic moisture .. us .. 3:017 or loss at 100? C. 
Combined water .. ia s .. 21:425 by difference 
Tron protoxide .. 2 5 ^, OO LTT 
» sesquioxide .. ea e 20365 | Soluble in er acid 
Phosphoric acid .. pes e .. Ol 018 
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. (o 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 xs erystals in 
the cavities. 
Chaleedony.—Otepopo. 
Mamumillated ; 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 0:5.  Effervesces with hydrochloric acid. 
* Trans. N.Z. Inst., HI, 280. T Hep. N.Z. Exh., 1865, p. 436. 
