Barringtonite—A new hydrous magnesium carbonate from Barrington Tops, New South Wales, Australia

1965 ◽  
Vol 34 (268) ◽  
pp. 370-372 ◽  
Author(s):  
Bebyl Nashar
Keyword(s):  
New South ◽  
Olivine Basalt ◽  
New South Wales ◽  
Magnesium Carbonate ◽  
Refractive Indices ◽  
X Ray ◽  
South Wales ◽  
Cell Dimensions

SummaryBarringtonite, a new hydrous magnesium carbonate of composition MgCO3,2H2O, is recorded from Sempill Creek, Barrington Tops, New South Wales, where it occurs as nodular encrustations on the surface of olivine basalt. The mineral is triclinic, biaxial positive, has refractive indices α = 1·458, β = 1·473, γ = 1·501, 2Vγ = 73° 44′, and using Ito's method (1949) cell dimensions α = 9·155 Å, b = 6·202 Å, c = 6·092Å, α = 94· 00′, β = 95· 32′, and γ = 108° 72′. The three strongest lines on an X-ray powder photograph give d values of 8·682, 3·093, and 2·936 Å.

Pyrosmalite in the Broken Hill lode, New South Wales

1957 ◽  
Vol 31 (236) ◽  
pp. 371-380 ◽  
Author(s):  
F. L. Stillwell ◽  
John McAndrew
Keyword(s):  
New South ◽  
New South Wales ◽  
Unit Cell ◽  
Mineral Species ◽  
Refractive Indices ◽  
Rich Variety ◽  
Broken Hill ◽  
South Wales ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

SummaryPyrosmalite is a widespread, though very limited, constituent of the Broken Hill lode, and is formed by the hydration and chlorination of the manganeseiron silicates. It is altered in contact with galena and eventually disintegrates into a mat of very fine fibres. The pyrosmalite varies substantially in ratio of Mn/Fe, and two specimens from the rare vughs and fractures gave on analysis ratios of 1·96 and 0·71. The refractive indices decrease slightly with increasing amounts of manganese and water, with a simultaneous small increase in the unit-cell dimensions. The name pyrosmalite is retained for the mineral species in accord with its earlier usage and its recent limitation to the iron-rich variety of an isomorphous series is not endorsed.

Oxo-mangani-leakeite from the Hoskins mine, New South Wales, Australia: occurrence and mineral description

2016 ◽  
Vol 80 (6) ◽  
pp. 1013-1021 ◽  
Author(s):  
Roberta Oberti ◽  
Massimo Boiocchi ◽  
Frank C. Hawthorne ◽  
Neil A. Ball ◽  
Paul M. Ashley
Keyword(s):  
Microprobe Analysis ◽  
New South ◽  
Structure Refinement ◽  
New South Wales ◽  
Ion Microprobe ◽  
X Ray ◽  
South Wales ◽  
Cell Dimensions ◽  
D Values ◽  
Unit Cell Dimensions

AbstractOxo-mangano-leakeite, a newly approved end-member of the amphibole supergroup (IMA-CNMNC 20150-35), has been found in a rock containing manganese silicate and oxide at the Hoskins Mine, a Mn deposit 3 km west of Grenfell, New South Wales. The end-member formula of oxo-mangani-leakeite is ANaBNa2C(Mn3+4Li)TSi8 O22WO2, which would require SiO2 53.15, Mn2O3 34.91, Li2O 1.66, Na2O 10.28, total 100.00 wt.%. The empirical formula derived for the sample of this work from electron and ion microprobe analysis using constraints resulting from single-crystal structure refinement is A(Na0.65K0.36)∑ = 1.01B(Na1.94Ca0.06)∑ = 2.00C(Mg1.60Zn0.01 Li0.58)∑ = 5.01T(Si7.98Al0.02)∑ = 8.00O22W(O1.34OH0.66)∑ = 2.00. Oxo-mangano-leakeite is biaxial (–), with α = 1.681, β = 1.712, γ = 1.738, all ± 0.002, and 2V (meas.) = 81.0(4)°, 2V (calc.) = 83.5°. The unit-cell dimensions are a = 9.875(5), b = 17.873(9), c = 5.295(2) Å, β = 104.74(3)°, V = 903.8 (7) Å3; the space group is C2/m, with Z = 2. The strongest ten reflections in the powder X-ray pattern [d values (in Å), I, (hkl)] are: 8.423, 100, (110); 3.377, 46, (131); 4.461, 40, (040); 4.451, 40, (021); 3.134, 37, (); 2.694, 37, (151); 2.282, 27, (); 2.734, 25, (3̅31); 2.575, 24, (061); 2.331, 24, [() ()]. The holotype material is deposited in the Canadian Museum of Nature, Ottawa, under the catalogue number CMNMC 86895.

Beidellitic montmorillonite from Swansea, New South Wales

Clay Minerals ◽  
1971 ◽  
Vol 9 (1) ◽  
pp. 107-123 ◽  
Author(s):  
J. D. Hamilton
Keyword(s):  
Coal Seam ◽  
Infrared Absorption ◽  
New South ◽  
New South Wales ◽  
Structural Formula ◽  
X Ray ◽  
South Wales ◽  
Heat Treated ◽  
Saturated Form ◽  
Image Position

AbstractThe minus 1μm fraction of an argillized vitric tuff, overlying the Wallarah Coal Seam near Swansea, N.S.W. is a nearly monomineralic (95%+) expandite clay, which hydrates and reacts to glycerol and heat treatments like montmorillonite. Results of X-ray, differential thermal, thermogravimetric and infrared absorption analyses confirm the general montmorillonoid character of the mineral, but chemical data indicate that much of its structure charge arises from substitutions in the tetrahedral zones of the lattice, as in beidellite rather than montmorillonite. The structural fOrmula deduced for the Ca++-saturated form of the minus 0.1μm clay is:The distinctive behaviours of the heat-treated NH4+- and Li+-saturated structures also suggest that the mineral is a 'beidellitic montmorillonite' rather than a montmorillonite.

Zinc-manganese carbonates from Broken Hill, New South Wales

1986 ◽  
Vol 50 (355) ◽  
pp. 49-53 ◽  
Author(s):  
W. D. Birch
Keyword(s):  
New South ◽  
New South Wales ◽  
Natural Occurrence ◽  
Solid Solution Series ◽  
Near Surface ◽  
X Ray ◽  
Broken Hill ◽  
South Wales ◽  
Uniform Composition ◽  
Locality Information

AbstractSpecimens of honey-brown to pinkish-brown globular carbonates encrusting concretionary goethite–coronadite from the oxidized zone at Broken Hill, New South Wales, have compositions in the rhodochrosite–smithsonite series. This may be the first extensive natural occurrence of this solid-solution series. Growth of the carbonates occurred in zones which have near uniform composition. The ratio MnCO3/(MnCO3 + ZnCO3) for each zone bears a linear relationship to the measured d spacing for the 104 X-ray reflections. Because cerussite is the only other mineral associated with the Zn-Mn carbonates and because of an absence of detailed locality information, the paragenetic significance of these minerals cannot be determined. The solutions depositing them may have been derived from the near-surface equivalents of the Zinc Lode horizons.

Partially-ordered mixed-layer mica-montmorillonite from Maitland, New South Wales

Clay Minerals ◽  
1967 ◽  
Vol 7 (1) ◽  
pp. 63-78 ◽  
Author(s):  
J. D. Hamilton
Keyword(s):  
Mixed Layer ◽  
New South ◽  
New South Wales ◽  
Structural Formula ◽  
X Ray Diffraction ◽  
Fourier Synthesis ◽  
Electron Microscopic ◽  
X Ray ◽  
Layer Sequence ◽  
South Wales

AbstractA mixed-layer clay mineral from a Permian sandstone at Maitland, New South Wales has been identified as 2:1 mica-montmorillonite structure with ‘imperfectly regular’ interstratification. The results from Fourier transform analysis and Fourier synthesis of 00l X-ray diffraction data have not fully elucidated the interlayering patterns but have indicated that there is complete alteration in the stacking and that the 1:1 (allevardite type) layer sequence relationship is strongly developed.X-ray diffraction, differential thermal, thermogravimetric, chemical, cation exchange and electron microscopic data for the mineral are given. The chemical analysis for the Na+-saturated material gives the structural formulaK0.90 Ca0.06 Na0.49 [Al3.52, Fe0.183+ Mg0.27 Ti0.03 (Al1.24 Si6.76) O20 (OH)4] H2OIt is considered that most of the fixed K+ and Ca++ ions are probably held in the mica interlayers, while the exchangeable components are largely accommodated in the expanded montmorillonite zones.

Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia

1994 ◽  
Vol 58 (393) ◽  
pp. 671-677 ◽  
Author(s):  
Y. Kawachi ◽  
P. M. Ashley ◽  
D. Vince ◽  
M. Goodwin
Keyword(s):  
Country Rock ◽  
New South ◽  
New South Wales ◽  
Alkali Feldspar ◽  
Chemical Compositions ◽  
South Wales ◽  
Cell Dimensions ◽  
New Localities ◽  
High Alkali ◽  
Silicate Rocks

AbstractSugilite relatively rich in manganese has been found at two new localities, the Hoskins and Woods mines in New South Wales, Australia. The occurrences are in manganese-rich silicate rocks of middle to upper greenschist facies (Hoskins mine) and hornblende hornfels facies (Woods mine). Coexisting minerals are members of the namansilite-aegirine and pectolite-serandite series, Mn-rich alkali amphiboles, alkali feldspar, braunite, rhodonite, tephroite, albite, microcline, norrishite, witherite, manganoan calcite, quartz, and several unidentified minerals. Woods mine sugilite is colour-zoned with pale mauve cores and colourless rims, whereas Hoskins mine sugilite is only weakly colour-zoned and pink to mauve. Within single samples, the chemical compositions of sugilite from both localities show wide ranges in Al contents and less variable ranges of Fe and Mn, similar to trends in sugilite from other localities. The refractive indices and cell dimensions tend to show systematic increases progressing from Al-rich to Fe-Mn-rich. The formation of the sugilite is controlled by the high alkali (especially Li) and manganese contents of the country rock, reflected in the occurrences of coexisting high alkali- and manganese-bearing minerals, and by high fo2 conditions.

High-iron bustamite and fluorapatite from the Broken Hill mine, New South Wales, Australia

1974 ◽  
Vol 39 (305) ◽  
pp. 601-604 ◽  
Author(s):  
K. Harada ◽  
H. Sekino ◽  
K. Nagashima ◽  
T. Watanabe ◽  
H. Momoi
Keyword(s):  
New South ◽  
Close Association ◽  
New South Wales ◽  
Chemical Analyses ◽  
X Ray ◽  
High Iron ◽  
Broken Hill ◽  
South Wales

SummaryHigh-iron bustamite and apatite occur as subhedral large crystals up to 1 to 2 cm wide and 10 cm long in close association with spessartine in the disseminated sphalerite- and galena-bearing diopside-roepperite-calcite skarn at the New Broken Hill Consolidated mine (N.B.H.S.), New South Wales, Australia. Complete chemical analyses of the minerals have been made, together with physical, optical, and X-ray studies.

Residual glasses from some alkali basaltic lavas from New South Wales

1966 ◽  
Vol 35 (274) ◽  
pp. 847-860 ◽  
Author(s):  
J. F. G. Wilkinson
Keyword(s):  
New South ◽  
Olivine Basalt ◽  
New South Wales ◽  
South Wales ◽  
Alkali Olivine Basalt ◽  
Host Rocks ◽  
Basaltic Lavas

SummaryThe glassy residua from an alkali olivine-basalt and a nephelinebasanite are respectively alkali trachytic and phonolitic in composition and contrast strongly with the compositions of the host rocks. The analysis of the glass from the alkali olivine-basalt reveals appreciable normative corundum, which is considered a consequence of the crystallization of excessive diopsidic clinopyroxene. This results in a deficiency in lime relative to alumina during the crystallization of much of the plagioclase. A consideration of the compositions of the glasses and the salic differentiates from alkaline basic intrusions indicates that the development of either trachyte or phonolite depends on differing degrees of undersaturation of the parental basic magmas.

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