Saturday, September 24, 2011

Australian Journal of Mineralogy Volume 3 Number 2

Cover Photograph: Diamond, Black Sands Creek, Beechworth, Victoria, 8.2 carats, Private Collection (collected 1975), Photo: Frank Coffa

The Coolgardie pegmatite field, Western Australia
M Jacobson

This notable Australian pegmatite locality has produced a range of lithium minerals as well as excellent specimens of columbite-tantalite group minerals.

The Daydream Mine, Silverton
J Leach

The Daydream mine now operates as a tourist mine but in its heyday was a rich source of silver. It is one of the few Australian localities where boleite has been found.

Iron phosphate minerals associated with ironstones in the Olary region, South Australia
P Ashley, B Lottermoser and K Scott

Ironstones occurring in the Proterozoic Willyama Supergroup in the Olary Block, South Australia, have been found to contain several uncommon iron phosphate minerals, apparently formed under supergene oxidation conditions. The minerals are fine-grained and occur as encrustations and cavity and fracture fillings, commonly in association with jarosite-type minerals. Two dark green phosphates, natrodufrenite and rockbridgeite, are the most abundant, but in places there are small amounts of strengite and chalcosiderite. The phosphate minerals may result from reaction between apatite in the ironstones or wedgetail eagle guano and Fe-bearing acid sulphate waters formed by oxidation of pyrite.

Saddlebackite, Pb2Bi2Te2S3, a new mineral species from the Boddington gold deposit, Western Australia
R Clarke

Saddlebackite, with an ideal formula of Pb2Bi2Te2S3 is a new mineral found in a gold-quartz specimen from beneath the lateritic gold orebody at Boddington, approximately 100km south-east of Perth, in Western Australia. It occurs in millimetre-sized aggregates in massive white quartz, intimately intergrown with gold, aleskite, tsumoite, altaite, galena and other, incompletely characterised, phases.