Baileychlore, the Zn end member of the trioctahedral chlorite series
Baileychlore occurs as dark green rims on colloform calcite veins within a strongly oxidized collapse karst-breccia containing altered andesite and garnet-vesuvianite skarn clasts at the Red Dome deposit near Chillagoe, Queensland, Australia. Baileychlore is a new Zn-rich chlorite. The ZnO contents are fairly uniform from 28.2 to 30.5 wt% at a depth of 89.6 m in the deposit, with a structural formula of (Zn/sub 2.50/Fe/sub 1.20//sup 2 +/Al/sub 1.17/Mg/sub 0.76/Mn/sub 0.01//sup 2 +/-()/sub 0.36/)(Si/sub 3.55/Al/sub 0.45/)O/sub 10/(OH)/sub 8/ for the most Zn-rich analysis, where () represents a cation vacancy. Baileychlore occurs as fine-grained transverse fibers exhibiting zoned pleochroic colors (green to yellow-green) along their length. Refractive indices are ..cap alpha.. = 1.582 and ..gamma.. = 1.614. The measured and calculated densities are 3.18(2) and 3.195 gcm/sup 3/, respectively. Combined DTA-TGA curves show a major endotherm at 550/sup 0/C, a small, double-bottomed endotherm in the range 680-750/sup 0/C, and an exotherm at 850/sup 0/C. The X-ray powder pattern is that of the Ib (..beta.. = 97/sup 0/) polytype. The strongest lines (24 given) are (d/sub obs/(I/sub obs/)(hkl)) 14.3(90)(001), 7.14(100)(002), 4.600(30)(02;11), 3.573(40)(004), 2.660(50)(201,130), 2.450(35)(203,132), and 1.542(60)(060,331). Unit-cell dimensions are a = 5.346(3), b = 9.257(4), c = 14.401(7) A, and ..beta.. = 97.12(5)/sup 0/. The symmetry is probably triclinic C anti 1 or C1 because of semi-random stacking. A one-dimension electron-density projection and an asymmetry value of +1.29 suggest a composition (Zn/sub 2.50/Al/sub 0.14/()/sub 0.36)//sup 0.58-/ for the octahedral sheet within the 2:1 layer and (Fe/sub 1.20//sup 2 +/Al/sub 1.03/Mg/sub 0.76/Mn/sub 0.01//sup 2 +/)/sup 1.03+/ for the interlayer sheet
- Research Organization:
- Univ. of Wisconsin, Madison (USA)
- OSTI ID:
- 5333973
- Journal Information:
- Am. Mineral.; (United States), Vol. 73:1-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ZINC COMPOUNDS
CHEMICAL PROPERTIES
CRYSTAL STRUCTURE
CALCITE
CHLORITE MINERALS
COLOR
DENSITY
DIFFERENTIAL THERMAL ANALYSIS
GEOLOGIC DEPOSITS
MOLECULAR STRUCTURE
QUEENSLAND
REFRACTIVITY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ZINC OXIDES
ALKALINE EARTH METAL COMPOUNDS
AUSTRALASIA
AUSTRALIA
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
GRAVIMETRIC ANALYSIS
MINERALS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SILICATE MINERALS
THERMAL ANALYSIS
580300* - Mineralogy
Petrology
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400201 - Chemical & Physicochemical Properties