Mineralogy Database

Lukrahnite Mineral Data

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General Lukrahnite Information

Help on Chemical  Formula: Chemical Formula: Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: CaCu0.6Zn0.5Fe3+0.8(AsO4)2(H2O)1.3(OH)0.7
Help on Environment: Environment: Ca analog of gartrellite. Tsumcorite group
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ludger Krahn (1957-), Geologischer Dienst Nordrhein-Westfalen, geologist who provided the initial specimen for study.
Help on Synonym: Synonym: IMA1999-030

Lukrahnite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9851:1:1.3358
Help on Cell Dimensions: Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: light yellow

Optical Properties of Lukrahnite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KC= 0.2042
Ncalc = 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.83, b=1.834, g=1.89, bire=0.0600

Calculated Properties of Lukrahnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.94 gm/cc
note: Specific Gravity of Lukrahnite =4.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0051607569
Boson Index = 0.9948392431
Help on Photoelectric: Photoelectric: PELukrahnite = 32.96 barns/electron
U=PELukrahnite x rElectron Density= 129.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lukrahnite is Not Radioactive

Lukrahnite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.02)(Anhydrous Normal Compound Anions)
  (43.02.02)Gartrellite Group Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1
Help on  Strunz Class: Strunz Class: 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
08.CG.20 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri
08.CG.20 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1
08.CG.20 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1
08.CG.20 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1
08.CG.20 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1
08.CG.20 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

Other Lukrahnite Information

Help on References: References: NAME( AmMin, Vol 87, p 766) PHYS. PROP.(AmMin, Vol 87, p 766) OPTIC PROP.(AmMin, Vol 87, p 766)
Help on See Also: See Also: 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

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Dana No: Strunz No: 08.CG.20





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