400 Transactions.—QG eoloqy. 
speeimen from Whakahara, on the Wairoa River, Auckland, where it occurs 
in a vein running through certain tufaceous beds in the Whakahara Saddle, 
between Maungarahu and Tokatoka. The crystals are long slender rhombic 
prisms, oP with pyramidal ends P. 
Chabasite, A} SP + Ca (Na, K) Si + 6 H, is mentioned by Dr. 
Hector in vesicular basalts near Dunedin (Jurors Rep. N.Z. Ex., 1865, 
p. 267), and by Dr. v. Haast in the trachyte of Banks Peninsula (Jurors’ 
Rep. N.Z. Ex., 1865, p. 257; there is also in the Catalogue of the Otago 
Museum a mention of a specimen from Helenburn. The specimens in 
the collection of the Colonial Museum are all from the first-named locality, 
and they consist of small rhombohedral crystals in cavities in the basaltic 
rocks. B.B. it deflagrates slightly and fuses to a pora enamel; colour 
brownish-white, no soda reaction visible. 
Gmelinite, A, Šis + Na (Ca, K) Si + 6H, is mentioned by Dr. 
Hector in vesicular basalts near Dunedin (Jurors’ Rep. N.Z. Ex., 1865, 
p. 267). Specimens from this locality in the collection of the Colonial 
Museum are pure white, small hexagonal pyramids with OP ends. B.B. 
gives faint soda reaction only. 
SILICATES OF ALUMINA, HYDROUS AND ANHYDROUS, 
Kaolin, Aj S? + 2 H, is mentioned by Dr. Hector at the Manuherikia 
Plains and Arrow River (Jurors’ Rep. N.Z. Ex., 1865, pp. 267, 488), and 
at the Whau, Auckland (Jurors’ Rep. N.Z. Ex., 1865, p. 85); and I have 
mentioned its occurrence at Mt. Somers, Canterbury (Geol. Rep., 1876-77, 
p. 6), where it is formed by the decomposition of felsite porphyries. Speci- 
mens from drift at Collingwood have also been forwarded to the Museum. 
Clay.—All the varieties of clay are found in the colony, but, for a de- 
tailed description of these with their analyses, I must refer the reader to 
the ** Manual of the Mineral Resources of New Zealand," by Dr. Hector, 
in course of publication. A very fine sample of pipeclay occurs at 
Hakateramea, Canterbury. 
Bole occurs as nests in the doleritic rocks passed through in the Lyttel- 
ton tunnel, and is associated with crystals of magnetite. Its specific 
gravity is 2:089, and = as follows :— 
Sili € am 
ca. 44-78 
Alumina 15:66 
YOD 16:87 
Manganese *60 
Lime .. 2:02 
Magnesia 5:02 
Potash E is EP i 2°69 
Water of constitution x ze theese 
