| Reference Type | Journal (article/letter/editorial) |
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| Title | Magnesio-hornblende from Lüderitz, Namibia: mineral description and crystal chemistry |
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| Journal | Mineralogical Magazine |
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| Authors | Oberti, Roberta | Author |
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| Boiocchi, Massimo | Author |
| Hawthorne, Frank C. | Author |
| Ciriotti, Marco E. | Author |
| Year | 2018 (December) | Volume | 82 |
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| Page(s) | 1253-1259 | Issue | 6 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2017.081.093Search in ResearchGate |
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| Mindat Ref. ID | 245097 | Long-form Identifier | mindat:1:5:245097:5 |
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| GUID | f5fac9cc-499e-49bd-8db3-5b3f02f5a437 |
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| Full Reference | Oberti, Roberta, Boiocchi, Massimo, Hawthorne, Frank C., Ciriotti, Marco E. (2018) Magnesio-hornblende from Lüderitz, Namibia: mineral description and crystal chemistry. Mineralogical Magazine, 82 (6) 1253-1259 doi:10.1180/minmag.2017.081.093 |
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| Plain Text | Oberti, Roberta, Boiocchi, Massimo, Hawthorne, Frank C., Ciriotti, Marco E. (2018) Magnesio-hornblende from Lüderitz, Namibia: mineral description and crystal chemistry. Mineralogical Magazine, 82 (6) 1253-1259 doi:10.1180/minmag.2017.081.093 |
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| Abstract/Notes | ABSTRACTMagnesio-hornblende (IMA2017-059) has been characterized in a specimen collected in the sand dunes of Lüderitz, Karas Region, Namibia. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is A(□0.73Na0.22K0.05)Σ1.00B(Ca1.79Fe2+0.10Mg0.04Mn2+0.03Na0.04)Σ2.00C(Mg3.48Fe2+0.97Al0.28Fe3+0.23Cr3+0.01Ti0.03)Σ5.00T(Si7.18Al0.82)Σ8.00O22W[(OH)1.93F0.05Cl0.02]Σ2.00. Magnesio-hornblende is biaxial (–), with α = 1.640(2), β = 1.654(2), γ = 1.666(2) (measured with gel-filtered Na light, λ = 589.9 nm), 2V (meas.) = 82(1)° and 2V (calc.) = 84.9°. The unit-cell parameters are a = 9.8308(7), b = 18.0659(11), c = 5.2968(4) Å, β = 104.771(6)° and V = 909.64 (11) Å3 with Z = 2 and space group C2/m. The strongest eight reflections in the X-ray powder pattern [d values (in Å), I, (hkl)] are: 2.709, 100, (151); 8.412, 74, (110); 3.121, 73, (310); 2.541, 58, ($\bar{2}$02); 3.386, 49, (131); 2.596, 45, (061); 2.338, 41, ($\bar{3}$51); and 2.164, 39, (261). |
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