The name of Monehiquite, first applied by Rosenbusch and Hunter (Tscherm. Min. Mitth. XI. 1890, p. 445) to a peculiar group of dyke rocks tound in association with elæolite syenite in Brazil, is rapidly becoming familial" to petrologists through the discovery of similar rocks from various other localities.

The Brazilian Monehiquites were described by Rosenbusch as black to grayish-black rocks, consisting of porphyritic ohvine and pyroxene, with widely varyiug amounts of hornblende and mica, in a glassy base usually crowded with hornblende microliths.

A Brief notice of this new mineral, which was found associated with Lewisite in the cinnabar-bearing sands of Tripuhy, near Ouro Preto, Minas Geraes, Brazil, has already been given by tile authors in Min. Mag. Vol. XI. No. 50, p. 85. Since that time a sufficient amount of material (1½ grms.) has been separated from the sand to permit a more detailed investigation of its crystallographic and chemical characters.

In a previous paper (Min. Mag. XI. 1895, p. 80), the result was given of an analysis of the new mineral, Zirkelite, which was discovered by Dr. Hussak in association with baddeleyite in the decomposing magnetite-pyroxenite of Jaeupiranga, S. Paulo, Brazil.

In that analysis only a small amount of material (less than a quarter of a grin.) was used, and no very serious attempt was made to separate small percentages of rare earths in the main zirconia precipitate.

Owing to the fact that aragonite frequently occurs in fibrous aggregations, as in "flos ferri,' it seems to have been sometimes assumed that all fibrous specimens of calcium carbonate are aragonite.

On these grounds the " satin spar" from Mston Moor in Cumberland is often referied to aragonite, although it has more than once been shown to be really calcite. Miller refers to it under aragonite, as being from "Dufton in Cumberland, '' saying that it contains 4.25 per cent. of manganese carbonate: these figures are those given by J. Holme in a very crude analysis of the satin spar of Alston.

Although zinekenite and wolfsbergite are to be considered as isomorphous, it seems to be as rare a thing to find simple crystals of zinekenite as it is to find twinned crystals of wolfsbergite. In the following note simple and twinned crystals of the two minerals respectively are described.

On the British Museum specimens of plagionite from Wolfsberg, in the Harz, all the well-established crystal forms previously recorded have been detected.

The little land-locked harbour of Pwllheli in Caernarvonshire owes its existence to a boss of igneous rock, which forms a natural breakwater, and which is known in Wales as the " Gimlet Rock."

The large quarries afford excellent exposures of the rock, which is worked into " setts " and used largely for paving purposes in the large towns of Lancashire, etc. It is a coarse ophitie dolerite, in which the augite is a very conspicuous mineral. The rock is traversed by many segregation veins, and is much jointed. The faces of the larger jointplanes are covered with crystals of quartz, calcite, a little natrolite, brookite and prehnite. But the three last-named minerals are of rare occurrence, and are always associated with quartz.

The micas presented by the granites of the Co. Dublin have been analysed by Haughton, and determined by him to be margarodites and lepidomel~lnes (see Proc. Roy. Irish Ac. Vol. VI. 1855, pp. 176-79, and Quart. Journ. Geol. Soc. Vol. XV. 1859, p. 129). In this latter paper he says:--" In my first paper on the Granites of Leinster (Quart. Journ. Geol. Soc. Vol. XII. 1856 p. 171), I have mentioned the black mica which is found accompanying the white margarodite of the Leinster granite in small flakes, and noticed the curious fact that these flakes are sometimes physically embedded in the plates of white mica without injuring their fissility or lustre, hut always eifecting a reduction of about 20° in the angle between the optic axes of the latter."

In 1887, when I was in charge of the Indian Geological Survey laboratory, a specimen of a mineral recently discovered in Afghanistán was sent to Calcutta by the British Agent at Kábul, with a request for information as to its nature and value. It proved to be nemalite, and a quantitative analysis of it, which was subsequently made by Mr. T. Blyth, is published in the fourth part of A Manual of the Geology of India, p. 161. As it seemed possible that the mineral might be capable of some useful application if plentiful, and it was in any case of mineralogical interest, a request was made to the Agent for further information about it, including the locality where it was found, and for additional specimens,

By the kindness of Mr. A. H. Bromly, Manager of the Choukpazat Gold Mining Company's mines at Choukpazat, Wuntho, Upper Burma, I have received a few hand-samples of the veinstuff from these mines. The vein runs in clay slate or ehloritic slate, parallel apparently to the bedding, with a strike north-east to south-west, and a dip of 20° to 25° to the south. The veinstuff, to judge from the samples submitted to me, consists of white, somewhat saccharoidal quartz, with some calcspar, and contains iron pyrites, alsenieal pyrites, visible free gold (rather pale in colour and apparently rich in silver), and the mineral that forms the subject of the present note.