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Lukrahnite Mineral Data |
General Lukrahnite Information |
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Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 | |
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Molecular Weight = 468.74 gm | |
Calcium 8.55 % Ca 11.96 % CaO | ||
Zinc 6.98 % Zn 8.68 % ZnO | ||
Iron 9.53 % Fe 13.63 % Fe2O3 | ||
Copper 8.13 % Cu 9.16 % Cu2O | ||
Arsenic 31.97 % As 49.03 % As2O5 | ||
Hydrogen 0.71 % H 6.34 % H2O | ||
Oxygen 34.13 % O | ||
______ ______ | ||
100.00 % 98.81 % = TOTAL OXIDE | ||
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CaCu0.6Zn0.5Fe3+0.8(AsO4)2(H2O)1.3(OH)0.7 | |
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Ca analog of gartrellite. Tsumcorite group | |
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Approved IMA 1999 (Dana # Added) | |
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Tsumeb mine, Namibia. Link to MinDat.org Location Data. | |
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Named for Ludger Krahn (1957-), Geologischer Dienst Nordrhein-Westfalen, geologist who provided the initial specimen for study. | |
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IMA1999-030 | |
Lukrahnite Crystallography |
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a:b:c =0.9851:1:1.3358 | |
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a = 5.457, b = 5.539, c = 7.399, Z = 1; alpha = 68.43°, beta = 68.9°, gamma = 69.44° V = 181.68 Den(Calc)= 4.28 | |
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Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 | |
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By Intensity(I/Io): 3.416(1)(112), 2.927(0.64)(111), 3.186(0.4)(012,102),2.533(0.3)(201,212), 2.7(0.3)(211), 2.832(0.26), 2.468(0.25), 4.953(0.22), | |
Physical Properties of Lukrahnite |
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None | |
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Yellow. | |
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Transparent | |
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Brittle - Generally displayed by glasses and most non-metallic minerals. | |
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Aggregates - Made of numerous individual crystals or clusters. | |
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Microscopic Crystals - Crystals visible only with microscopes. | |
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Spherical - Spherical, rounded aggregates. | |
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5 - Apatite | |
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Vitreous - Adamantine | |
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light yellow | |
Optical Properties of Lukrahnite |
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CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2051,KC= 0.2042 Ncalc = 1.85 |
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Biaxial (+), a=1.83, b=1.834, g=1.89, bire=0.0600 | |
Calculated Properties of Lukrahnite |
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Bulk Density (Electron Density)=3.94 gm/cc note: Specific Gravity of Lukrahnite =4.15 gm/cc. |
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Fermion Index = 0.0051607569 Boson Index = 0.9948392431 |
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PELukrahnite = 32.96 barns/electron U=PELukrahnite x rElectron Density= 129.86 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lukrahnite is Not Radioactive |
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Lukrahnite Classification |
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43.02.02.03 (43)Compound Phosphates, etc. | |
(43.02)(Anhydrous Normal Compound Anions) | ||
(43.02.02)Gartrellite Group | ||
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08.CG.20 08 - PHOSPHATES, ARSENATES, VANADATES | |
08.C - Phosphates without Additional Anions, with H2O | ||
08.CG -With large and medium-sized cations, RO4:H2O = 1:1 | ||
Other Lukrahnite Information |
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NAME( AmMin, Vol 87, p 766) PHYS. PROP.(AmMin, Vol 87, p 766) OPTIC PROP.(AmMin, Vol 87, p 766) | |
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Links to other databases for Lukrahnite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - Handbook of Mineralogy (MinSocAm) 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas 12 - Ruff.Info Search for Lukrahnite using: Visit our Advertisers for Lukrahnite : Ask about Lukrahnite here : Print or Cut-and-Paste your Lukrahnite Specimen Label here :
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