| Reference Type | Journal (article/letter/editorial) |
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| Title | Barlowite, Cu4FBr(OH)6, a new mineral isotructural with claringbullite: description and crystal structure |
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| Journal | Mineralogical Magazine |
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| Authors | Elliott, Peter | Author |
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| Cooper, Mark A. | Author |
| Pring, Allan | Author |
| Year | 2014 (December) | Volume | 78 |
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| Page(s) | 1755-1762 | Issue | 7 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2014.078.7.17Search in ResearchGate |
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| Mindat Ref. ID | 244604 | Long-form Identifier | mindat:1:5:244604:6 |
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| GUID | c4c48e5a-e107-4065-8af9-099abb9226f9 |
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| Full Reference | Elliott, Peter, Cooper, Mark A., Pring, Allan (2014) Barlowite, Cu4FBr(OH)6, a new mineral isotructural with claringbullite: description and crystal structure. Mineralogical Magazine, 78 (7) 1755-1762 doi:10.1180/minmag.2014.078.7.17 |
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| Plain Text | Elliott, Peter, Cooper, Mark A., Pring, Allan (2014) Barlowite, Cu4FBr(OH)6, a new mineral isotructural with claringbullite: description and crystal structure. Mineralogical Magazine, 78 (7) 1755-1762 doi:10.1180/minmag.2014.078.7.17 |
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| Abstract/Notes | AbstractThe new mineral species barlowite, ideally Cu4FBr(OH)6, has been found at the Great Australia mine, Cloncurry, Queensland, Australia. It is the Br and F analogue of claringbullite. Barlowite forms thin blue, platy, hexagonal crystals up to 0.5 mm wide in a cuprite-quartz-goethite matrix associated with gerhardtite and brochantite. Crystals are transparent to translucent with a vitreous lustre. The streak is sky blue. The Mohs hardness is 2–2.5. The tenacity is brittle, the fracture is irregular and there is one perfect cleavage on {001}. Density could not be measured; the mineral sinks in the heaviest liquid available, diluted Clerici solution (D &3.8 g/cm3). The density calculated from the empirical formula is 4.21 g/cm3. Crystals are readily soluble in cold dilute HCl. The mineral is optically non-pleochroic and uniaxial (–). The following optical constants measured in white light vary slightly suggesting a small variation in the proportions of F, Cl and Br: ω 1.840(4)–1.845(4) and ε 1.833(4)–1.840(4). The empirical formula, calculated on the basis of 18 oxygen atoms and H2O calculated to achieve 8 anions and charge balance, is Cu4.00F1.11Br0.95Cl0.09(OH)5.85. Barlowite is hexagonal, space group P63/mmc, a = 6.6786(2), c = 9.2744(3) Å , V = 358.251(19) Å3, Z = 2. The five strongest lines in the powder X-ray diffraction pattern are [d(Å )(I)(hkl)]: 5.790(100)(010); 2.889(40)(020); 2.707(55)(112); 2.452(40)(022); 1.668(30)(220). |
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