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Johillerite Mineral Data

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General Johillerite Information

Help on Chemical  Formula: Chemical Formula: Na(Mg,Zn)3Cu(AsO4)3
Help on Composition: Composition: Molecular Weight = 610.00 gm
   Potassium    0.19 %  K     0.23 % K2O
   Sodium       2.90 %  Na    3.91 % Na2O
   Magnesium    8.69 %  Mg   14.40 % MgO
   Aluminum     0.27 %  Al    0.50 % Al2O3
   Zinc         1.39 %  Zn    1.73 % ZnO
   Iron         2.38 %  Fe    3.40 % Fe2O3
   Copper      16.15 %  Cu   20.21 % CuO
   Arsenic     36.36 %  As   55.76 % As2O5
   Phosphorus   0.20 %  P     0.47 % P2O5
   Oxygen      31.47 %  O
              ______        ______ 
              100.00 %      100.63 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.77K0.03Mg2.18Zn0.13Cu1.55Fe3+0.26Al0.06As2.96P0.04O12
Help on Environment: Environment: Found in cavities in altered tennantite-chalcocite ore.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Johannes Eric Hiller (1911-1972), professor of mineralogy, Stuttart, Germany.
Help on Name Pronunciation: Name Pronunciation: Johillerite + Pronunciation Say JOHILLERITE
Help on Synonym: Synonym: ICSD 63284
  PDF 35-522

Johillerite Image

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Comments: Violet-blue grains of johillerite on matrix.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: Specimen Size 0.5x1 cm.
© Diederik Visser

Johillerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.53:1:0.8688
Help on Cell Dimensions: Cell Dimensions: a = 6.752, b = 12.739, c = 11.068, Z = 4; beta = 100.37° V = 936.45 Den(Calc)= 4.33
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.75(1), 3.25(0.8), 4.06(0.5),1.66(0.5), 2.64(0.5), 1.682(0.4), 1.954(0.4), 3.5(0.4),

Physical Properties of Johillerite

Help on Cleavage: Cleavage: {010} Perfect, {100} Good, {001} Good
Help on Color: Color: Violet.
Help on Density: Density: 4.15
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Johillerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1725,KPDmeas= 0.18,KC= 0.1767
Ncalc = 1.73 - 1.77
Help on Optical Data: Optical Data: Biaxial (+), a=1.715, b=1.743, g=1.783, bire=0.0680, 2V(Calc)=82, 2V(Meas)=80.

Calculated Properties of Johillerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Johillerite =4.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0099134207
Boson Index = 0.9900865793
Help on Photoelectric: Photoelectric: PEJohillerite = 34.09 barns/electron
U=PEJohillerite x relectron= 132.61 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 2.59 (Gamma Ray American Petroleum Institute Units)
Concentration of Johillerite per GRapi unit = 38.63 (%)

Estimated Radioactivity from Johillerite - barely detectable


Johillerite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.02)(A+ B++)5 (XO4)3
  (38.02.03)Alluaudite-Wyllieite Group (Alluaudite Subgroup) Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 21/a 2/m Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 21/a 2/m Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 21/a 2/m Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m Yazganite! NaFe2(Mg,Mn)(AsO4)3•H2O C 2/c 2/m IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/c 2/m IMA2008-064! Na16Mn25Al8(PO4)30 Pc m
Help on  Strunz Class: Strunz Class: 08.AC.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.10 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m
08.AC.10 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m
08.AC.10 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 21/a 2/m
08.AC.10 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 2/m
08.AC.10 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 21/a 2/m
08.AC.10 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m
08.AC.10 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m
08.AC.10 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m
08.AC.10 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 21/a 2/m
08.AC.10 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m
08.AC.10 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m
08.AC.10 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m
08.AC.10 Yazganite! NaFe2(Mg,Mn)(AsO4)3•H2O C 2/c 2/m
08.AC.10 IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/c 2/m

Other Johillerite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, CanMin, v 42, p 717) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Johillerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.AC.10





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