Marshite–miersile solid solution and iodargyrite from Broken Hill, New South Wales, Australia

1998 ◽  
Vol 62 (04) ◽  
pp. 471-475 ◽  
Author(s):  
P. W. Millsteed
Keyword(s):  
Solid Solution ◽  
Limit Of Detection ◽  
New South ◽  
Cell Parameters ◽  
Cu Content ◽  
Broken Hill ◽  
South Wales ◽  
Complete Solid Solution ◽  
Vegard’S Law ◽  
End Members

Abstract Microprobe analysis of marshite and miersite from Broken Hill, Australia, demonstrate extensive solid solution between the end-members CuI and AgI, indicating the possibility of a complete solid-solution series. Unit-cell parameters increase from 6.054 Å for marshite to 6.504 Å for miersite, closely following Vegard's Law. The Cu content of iodargyrite is generally below the limit of detection, but one zoned crystal contained 0.28 wt.% Cu. Crystallization of either miersite or iodargyrite at Broken Hill appears to be dependent upon the local availability and ratio of copper, silver and iodine ions.

An Approach to the Solid Solution Problem Using a Computerized Identification Technique

1969 ◽  
Vol 13 ◽  
pp. 539-549
Author(s):  
Gerald G. Johnson ◽  
Frank L. Chan
Keyword(s):  
Solid Solution ◽  
Powder Diffraction ◽  
Lattice Parameter ◽  
Powder Diffraction File ◽  
X Ray ◽  
Complete Solid Solution ◽  
Vegard’S Law ◽  
Identification Technique ◽  
Approximate Composition ◽  
End Members

Since for most real systems, solid solution effects influence the position and intensity of the x-ray powder diffraction pattern, it is desirable and necessary to have an automatic system which will identify standard reference phases regardless of the amount of solid solution. Using the system CdS-ZnS, where the lattice parameter a0 changes from 4.136 to 3.820Å, with complete solid solution over the entire range of composition, an illustrative study was made. This work presents the results obtained from a computer analysis of the powder pattern obtained. It has been found that if the starting chemistry is known and the end members of the series are in the ASTM Powder Diffraction File, that the solid solution can be identified. Once the phases present are identified, a plot following Vegard's law yields the approximate composition of the sample under consideration. These two methods of compositional determination agree quite well. Examples of the computer system and description of the program input and output with interpretation of the results will be discussed.

Corkite from Aggeneys, Bushmanland, South Africa

1990 ◽  
Vol 54 (377) ◽  
pp. 603-608 ◽  
Author(s):  
H. de Bruiyn ◽  
W. A. Van Der Westhuizen ◽  
G. J. Beukes ◽  
T. Q. Meyer
Keyword(s):  
Solid Solution ◽  
General Formula ◽  
Regional Distribution ◽  
The Other ◽  
Iron Formation ◽  
Charge Balance ◽  
X Ray Diffraction ◽  
Broken Hill ◽  
Complete Solid Solution ◽  
End Members

AbstractCorkite associated with plumbojarosite and goethite occurs in gossan and iron-formation at Black Mountain and Broken Hill, Aggeneys. Electron microprobe analyses indicate that there are two groups of corkite present in the area; one with high Cu and low (PO4)3− and the other with low Cu and high (PO and the other with low Cu and high (PO4)3− contents. This can be explained in terms of the general formula contents. This can be explained in terms of the general formula AB2(XO4)2(OH)6, where the incorporation of divalent ions in the B site is accompanied by the exchange of trivalent anions by divalent ones to retain charge balance. Complete solid-solution is inferred between (SO4)2−and (PO4)3− end members, indicating that the jarosite and beudantite groups form part of the same solid-solution series. The distribution of Zn in corkite also reflects the regional distribution of zinc grades in the area, becoming more zinc-rich from west to east. New X-ray diffraction parameters are also presented which update existing data.

Compositional segregation and solid solution in the lead-dominant alunite-type minerals from Broken Hill, N.S.W.

1996 ◽  
Vol 60 (402) ◽  
pp. 779-785 ◽  
Author(s):  
K. J. Rattray ◽  
M. R. Taylor ◽  
D. J. M. Bevan ◽  
A. Pring
Keyword(s):  
Solid Solution ◽  
Strong Coupling ◽  
New South ◽  
Oscillatory Zoning ◽  
Broken Hill ◽  
Ore Body ◽  
South Wales ◽  
Cell Data ◽  
Unit Cell Data ◽  
Compositional Segregation

AbstractA study of the composition and unit cell data of a suite of lead-rich minerals of the alunite-jarosite group from the oxidized zone of the ore body at Broken Hill, New South Wales, Australia, has revealed almost complete XO4 (X = As, P, S) solid solution in these minerals at this deposit. The species in the group noted are hidalgoite, hinsdalite, beudantite, segnitite and plumbogummite. These minerals at Broken Hill exhibit a number of growth textures, including oscillatory zoning, colloform banding and replacements. Zoning in these minerals is due to the segregation of Al- and Fe-rich members, and compositions indicate a strong coupling of Fe3+ with and Al with

Metamorphic pyroxenes from the Broken Hill district, New South Wales

1962 ◽  
Vol 33 (259) ◽  
pp. 320-338 ◽  
Author(s):  
R. A. Binns
Keyword(s):  
Solid Solution ◽  
Ferrous Iron ◽  
New South ◽  
Regional Metamorphism ◽  
New South Wales ◽  
Metamorphic Grade ◽  
Detectable Change ◽  
Broken Hill ◽  
South Wales ◽  
Hill District

SummaryThe Archean rocks of the Barrier Ranges, New South Wales, show zones of progressive regional metamorphism of which the highest is characterized by orthopyroxene-bearing basic granulites. Within this zone, further increase in metamorphic grade results in a detectable change in distribution of ferrous iron and magnesium between coexisting orthopyroxene and clinopyroxene, the latter becoming relatively richer in iron. Mutual solid solution between the two pyroxene phases also appears to increase. The value of coexisting pyroxenes as indicators of metamorphic grade is thus established. There are some points of disagreement between the Broken Hill results and previously advanced theories of cation distribution in pyroxenes.

scholarly journals Broken Hill, New South Wales

Nature ◽  
1924 ◽  
Vol 113 (2845) ◽  
pp. 697-698
Keyword(s):  
New South ◽  
New South Wales ◽  
Broken Hill ◽  
South Wales

Myrmekite and muscovite developed by retrograde metamorphism at Broken Hill, New South Wales

1972 ◽  
Vol 38 (297) ◽  
pp. 570-578 ◽  
Author(s):  
Evan R. Phillips ◽  
D. M. Ransom ◽  
R. H. Vernon
Keyword(s):  
Late Stage ◽  
New South ◽  
New South Wales ◽  
Retrograde Metamorphism ◽  
Broken Hill ◽  
South Wales ◽  
Proportionality Relationship

SummaryRetrograde metamorphism of gneisses and pegmatites leads in part to the destruction of feldspar and its replacement by late-stage lobate myrmekite and muscovite. Reactions promoted by retrogression suggest a range in volume of quartz production that may supplement that developed by exsolution and lead to deviations from the strict proportionality relationship suggested by previous workers. There is no need, however, to propose that quartz in myrmekite originates by constriction of pre-existing quartz within exsolved albite.

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