Ill The N.Z. Journal of Science and Technology. [Mar. 
5. Hokitika River, as loose boulders. Bull. No. 0, 1918, p. 123. 
6. Ross. Lab., No. 19, 1.885, p. 37. 
7. Kawarau, Dunstan, and Clutha. Cox, Trans., vol. 14, 1882, p. 426. 
8. Skipper’s Point (Shotover River). Bull. No. 7, 1909, p. 95. 
9. Hindon, Otago. Morgan, MS. 
10. Waipori, Otago. Bull. No. 19, 1918, p. 39 (“ Cemetery Lode ”). 
None of these occurrences can be said to have any commercial value. 
Skey’s analysis of a very impure specimen of rhodonite, containing much 
oxide of iron, mentioned by Hector in Rep. Geol. Explor., No. 21, 1892, 
p. 117, has not been further traced. 
Rhodochrosite or dialogite, the carbonate of manganese, occurs at— 
1. Pahi, North Auckland. Lab., No. 49, 1916, p. 21. 
2. Tararu. Lab., No. 6, 1871, p. 23 ; Bull. No. 10. See also Rep. 
Geol. Explor., No. 6, 1871, p. 85, and Cox, 1882, p. 426. 
3. Talisman Mine, Karangahake. Bull. No. 16, 1913, p. 90. 
4. Waitekauri. Park, 1910. 
5. Waihi, Waihi Grand Junction, and Waihi Beach Mines. Bull. 
No. 15, 1912, p. 59. 
6. Near Kaitake Range (Pukeiti Hill), Taranaki. Lab., No. 47, 1914, 
p. 26. 
7. Paraparaumu. Lab., No. 24, 1890, p. 35, and No. 33, 1900, p. 14. 
8. Makara. Trans., vol. 14, 1882, p. 426 ; Lab., No. 23, 1889, p. 64 ; 
Skey, 1870 (according to Hector, 1892). 
9. Whareama. Lab., No. 23, 1889, p. 63 (sample No. 4950). 
The occurrence of rhodochrosite near Paraparaumu may be of some 
importance. Large boulders of the mineral were found in or about 1888, 
and the parent lode was discovered some time later. In 1899 it was 
examined by Alexander McKay, whose report will be found in Parliamentary 
Paper C.-9, 1889 (bound in Mines Report), pp. 2-3. Analyses of the ore 
give 63*02 and 84*2 per cent, of manganese carbonate, with some calcium 
carbonate, silica, &c. Some of the material is very siliceous (? rhodonite). 
McKay states that the outcrop has been traced for a distance of 5 to 
7 chains, and over a range in height of 200 ft. The thickness of the lode 
at the outcrop varies from 3 ft. to 10 ft. 
The various oxides of manganese, with or without combined water, have 
a very wide distribution in New Zealand. In the list of occurrences given 
below no attempt to separate the various minerals will be made. This 
can be done to a considerable extent by consulting the references supplied. 
Pyrolusite and braunite occur, but the commonest manganese minerals 
are the hydrous oxides manganite and psilomelane. Wad, containing up 
to 30 per cent, of water, is common as a surface deposit and in the gold¬ 
mines of the Hauraki Peninsula. 
The localities where manganese oxides have been recorded are nearly 
all in the following list:— 
1. Mangonui. Lab., No. 25, 1891, p. 66, and No. 28, 1894, p. 18. 
2. Whangaroa district, various localities. Bull. No. 8, 1909, pp. 94-95 ; 
Lab., No. 42, 1909, p. 28. 
3. Waimate North. Same references as Whangaroa. 
4. Okaihau. Ijab., No 28, 1894, p. 19. 
5. Bay of Islands, Russell, &c. Lab., No. 3, 1868, p. 13 (no analysis) ; 
No. 13, 1878, p. 27 (Rapaka) ; No. 14, 1879, p. 33 (Manawara) ; 
No. 16, 1882, p. 39 ; No. 23, 1889, pp. 59, 63 ; No. 27, 1893, 
pp. 35-36. 
