Page:Transactions NZ Institute Volume 15.djvu/483

springs occur (Hochstetter, New Zealand, 1863, Eng. ed., p. 401). It is found again as an efflorescence on the sulphur sands of lower cretaceous age at Waipara (Haast, Geol. Rep., 1870–71, p. 11), and at various other localities; and the late Mr. E. H. Davis mentions its occurrence (Geol. Rep., 1870–71, p. 131) in Doran's No. 2 Reef, at Wangapeka. Analyses of samples from White Island have given the following results:—

	Liversidge.						Cox.
	${\displaystyle \scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } }}$						${\displaystyle \scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad } }}$
Sulphur	99.614		99.554		98.888		99.9		94.1		62.5
Foreign matter	.386		.446		1.112		.1		5.9		37.5
	100.000		100.000		100.000		100.0		100.0		100.0

They vary in physical characters from a massive rich sulphur yellow mineral to a loose friable variety with a pale-greenish tinge and some very beautiful, although small, crystals also occur. These are of a pale-greenish colour, and consist chiefly of sharp acicular rhombic prisms; but some very unusual combinations also occur which have been described by the late Mr. E. H. Davis (Trans. N.Z. Inst., vol. iii., p. 284). They are frequently associated with crystals of selenite.

Selenium, Se.—Prof. Liversidge (Trans. N.Z. Inst., vol. x., p. 491) states that he obtained traces of selenium in the massive yellow variety of sulphur from White Island.

Haloids and Salts. Salts of ammonia, potash, soda, baryta, strontia, lime, magnesia, alumina, yttria, and ceria.

Glauber Salts, Ṅa …S + 10 Ḣ.—A specimen of this mineral was forwarded for determination by Mr. W. H. Beetham in 1874. The locality of its occurrence is Brancepeth, Whareama, Wellington.

Barytes, Ḃa …S.—This mineral was collected by Dr. Hector from Akiteo in 1867, and Mr. Skey mentions its occurrence (Geol. Rep. 1870–71, p. 85) in the auriferous reefs of the Thames. Mr. McKay collected a specimen from Paonui Point, near Napier, in 1874, and specimens have also been received from Te Arai Point, Auckland, and from near East Cape. The following specimens are at present in the collection of the Colonial Museum:—

1. Crystals of Barytes.—Crown Princess Claim, Thames. Of a pure white colour, the largest crystal being about half an inch long. They are of a tabular form, consisting of the prism ∞P; the brachypinacoid ∞P̆∞ and the basal pinacoid OP, but in some forms the brachypinacoid is replaced by small faces of the brachydome P̆∞.