Australian Museum Journal Compositions of silver halides from the Broken Hill district, New South Wales

Shortform:
Gillard et al., 1997, Rec. Aust. Mus. 49(3): 217–228
Author(s):
Gillard, Robert D.; Hart, Alan D.; Humphreys, D. Alun; Symes, R. F.; Williams, P. A.
Year published:
1997
Title:
Compositions of silver halides from the Broken Hill district, New South Wales
Serial title:
Records of the Australian Museum
Volume:
49
Issue:
3
Start page:
217
End page:
228
DOI:
10.3853/j.0067-1975.49.1997.1268
Language:
English
Date published:
22 December 1997
Cover date:
22 December 1997
ISSN:
0067-1975
CODEN:
RAUMAJ
Publisher:
The Australian Museum
Place published:
Sydney, Australia
Digitized:
17 February 2009
Available online:
16 July 2009
Reference number:
1268
EndNote package:
EndNote file
Title page:
Title page (96kb PDF)
Complete work:
Complete work (1533kb PDF)

Abstract

Some 320 specimens of silver halides from the Broken Hill field, New South Wales, held in the collections of the Australian Museum have been examined. On the basis of colour and habit variations, 42 specimens were selected for analysis. Contrary to previous suggestions, compositions of individual specimens are highly variable and reflect a complex crystallisation history. Bromargyrite has been detected for the first time away from the Broken Hill main lode horizon. Compositions are discussed in terms of the lacunar nature of the appropriate phase diagrams; natural material is shown to reflect compositions of synthetic phases prepared at about 25°C. No obvious relationship between composition and physical properties could be detected for the chlorargyrite-bromargyrite series. This highlights the difficulties of visual identifications.