Page:Transactions NZ Institute Volume 15.djvu/509
Daintree, Esq., F.G.S. (Trans. N.Z. Inst., vol. vii., p. 458), and is again alluded to by Prof. Liversidge, from Dusky Bay and Charleston. (Trans. N.Z. Inst., vol. x., p. 497).
Lepidolite.—The occurrence of this mineral is mentioned by Dr. Hector in the gneiss of the West Coast and in the marble of Thompson Sound (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 437).
Biotite, S̈i + (Ṁg, K̇, Ḟe)3 S̈i, is mentioned by Dr. Hector (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 437) as occurring on the West Coast, and there are specimens in the collection of the Colonial Museum from Milford Sound and Doubtful Inlet. In the last locality it occurs as a black-green mica rock with numerous minute crystals of zircon.
Rubellane is mentioned by Dr. v. Haast as occurring in the volcanic rocks of Banks Peninsula (Jurors' Rep. N.Z. Ex., 1865, p. 257).
Lepidomelane, ( ) S̈i + (Ḟe, K̇) S̈i.—This mineral is mentioned by Dr. Hector (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 437) in the schists and gneiss of the West Coast, and there are specimens in the collection of the Colonial Museum from Milford Sound, where it occurs in thin hexagonal plates of a blackish-green colour, bronze by reflected light in certain positions; streak, dirty green. Thin laminæ slightly flexible, rather brittle. Before the blowpipe becomes bronze-yellow, and does not fuse.
Margarite, 2 S̈i + (Ċa, Ṅa, Ṁg) S̈i + Ḣ, is mentioned by Dr. Hector (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 437) in the schists and gneiss of the West Coast, and by Dr. v. Haast from the same localities (Jurors' Rep. N.Z. Ex., 1865, p. 257). There is a small specimen in the collection of the Colonial Museum from Milford Sound of a pearl-grey colour.
Chrome Mica.—This mineral is a chrome-magnesian mica, occurring in flat tabular plates of a green colour, and belongs to the hexagonal system. It is talcose in appearance and feels soapy to the touch, but Mr. Skey's analysis precludes its falling into the talc group, and it must therefore be considered as a chrome-magnesian mica, the percentage of water in which is somewhat high. A somewhat similar mineral from Schwartzenstein, analyzed by Schafhautl, is mentioned in Dana's System of Mineralogy, but it contains more silica and less alumina than this specimen.
| Schwartzenstein. | Dead-horse Gully. | ||
| Silica | 47.68 | 39.25 | |
| Alumina | 15.15 | 22.12 | |
| Chromic oxide | 5.90 | 1.56 | |
| Ferric oxide | 5.72 | 18.69 | |
| Manganous oxide | 1.05 | .41 | |
| Magnesic oxide | 11.58 | 10.60 | |
| Sodic oxide | 1.17 | 1.13 | |
| Potassic oxide | 7.27 | ||
| Water | 2.86 | 4.06 | |
| Lime | — | 2.18 | |
| 98.38 | 100.00 |
