During my mapping for the Geological Survey in 1930 of the metamorphic rocks of western Unst, numerous small masses were encountered that were composed of a central part of talc followed outwards in order by zones of actinolite, chlorite, and biotite. Whilst revisiting the island in 1933 I was able to examine these associations in detail and to collect abundant material for study. As in many cases the zones are made up of a single mineral and may be a foot or so in thickness, specimens of great beauty are obtainable.

During the examination of the basalts of Calciferous Sandstone age which are mapped on the one-inch Sheet 23 (Hamilton, Lanarkshire) Scotland, the peculiarities of zoning exhibited by the porphyritic felspar were studied in some detail. As only a summary of the details is possible in the memoir explanatory of the geology of this Sheet, the description of the zoning is offered here, and some conclusions regarding the magmatic history of the zoned felspars are presented.

In 1890, L. V. Pirsson 2 described under the name of mordenite a crystalline mineral, isomorphous with heulandite, occurring in a highly weathered amygdaloidal basalt in the Hoodoo Mts., Wyoming. His analysis (1, table I) showed that the mineral had a composition near that of the original mordenite of H. How (1864) and his assumption that it represented a platy-crystalline phase of that normally fibrous mineral was generally accepted.

In two-circle goniometry as usually practised, the zone-adjustment is almost invariably used. It would be difficult to discover the reasons which have led to this unfortunate neglect of the face-adjustment; actually the face-adjustment has all the advantages of the zone-adjustment without its defects.

The mineral berthierite has hitherto been known from two localities in the region of the Carpathian Mountains. It was first recorded by A. Löwe in 1847 from Aranyidka in the Hungarian comitat Abauj-Torna, where it occurred' massive and disseminated, columnar and fibrous, with jamesonite and stibnite'. Much later, about 1908, J. Krenner recognized it from Felsőbánya in the Hungarian comitat Szatmár but his paper describing it, which was read before the Hungarian Academy of Sciences on October 19, 1908, was not published until after his death.

Unfortunately nothing is known of the history of this stone. It was found in 1933 by Mr. R. Bedford in the old museum at Port Adelaide in South Australia. Attached to the specimen is a small label with the number 23, and accompanying it was a card giving in faded writing the information '(23) Meteoric stone from Silverton'. The Port Adelaide Museum has been in a neglected condition for thirty years, and recently it has been decided to reorganize it as a Nautical Museum, and to discard all mineral and miscellaneous material.