Saturday, September 24, 2011

Australian Journal of Mineralogy Volume 2 Number 1

Cover Photograph: Winner of AJM Photographic Competition, Mimetite, Sabine's Shaft, Mount Bonnie mine, Near Pine Creek, Northern Territory, Specimen 2x5 cm, Photo and specimen: Brian England

Some Mines of the Mt Isa District, Queensland, Part 3 - The Mount Oxide Mine
B Day and B Beyer

The historic and remote Mt Oxide mine has recently been the source of a range of beautiful and rare minerals. It is the type locality for sieleckiite, and the phosphate and sulphate suites, in particular, are quite notable. This paper describes several species not previously recorded from the mine.

Zeolites and associated minerals from Borambil, NSW
B England

Tertiary basalt exposed in a road cutting near Borambil, New South Wales during roadworks in the early 1970s contained abundant vesicles lined with chabazite and thomsonite associated with calcite and an unknown silicate mineral occurring as flexible colourless hair-like crystals. Also present were rare levyne-offretite, analcime and phillipsite. These species are consistent with a silica-poor environment. Chemical compositions of the zeolite species as determined by energy dispersive X-ray microanalysis are uniform and fall within the composition ranges quoted in the literature. Microanalyses of the unknown silicate indicate a 3D framework structure [O/(Si+Al)=2] but its composition and morphology match none of the known framework-structured minerals. The locality is notable in that it is one of the few in New South Wales that contains abundant thomsonite.

The Francis Collection
A Pring

The mineral collection of Glyn and Maxine Francis is one of the best private collections ever assembled in Australia. Within it, the suite of 400 specimens from Iron Monarch in the Middleback Ranges of South Australia is probably the best and most complete collection from a single important Australian deposit.

Post-mine Sulphates from the Teutonic Bore base metal deposit, Western Australia
L Lawrence, P Clarke, C Stocksief and P Williams

The Teutonic Bore silver-lead-zinc-copper deposit lies some 60km north-west of Leonora in the North-east Goldfields of the Yilgarn Craton of Western Australia, 900km by road north-east of Perth. Since mining ceased in 1984, dump material has been oxidising at a substantial rate with soluble sulphates being carried into small depressions or swales adjacent to the dumps and there crystallizing during the long periods of hot dry weather. Similar salts are forming on the dumps themselves and it is quite likely that some of them, at least, also formed in the upper parts of the zone of oxidation, prior to the commencement of mining. All the minerals described here are post-mine products. The attractive range of bright blues, greens and white exhibited by the minerals at Teutonic Bore caught the attention of local geologists and much specimen collecting ensued.