Johillerite Mineral Data

General Johillerite Information

Chemical Formula:

Na(Mg,Zn)3Cu(AsO4)3

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

Empirical Formula:

Na_0.77K_0.03Mg_2.18Zn_0.13Cu_1.55Fe³⁺_0.26Al_0.06As_2.96P_0.04O₁₂

Environment:

Found in cavities in altered tennantite-chalcocite ore.

IMA Status:

Approved IMA 1982

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Johannes Eric Hiller (1911-1972), professor of mineralogy, Stuttart, Germany.

Name Pronunciation:

Johillerite + Pronunciation

Synonym:

ICSD 63284

PDF 35-522

Johillerite Image

Images:

Johillerite

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

Johillerite Crystallography

Axial Ratios:

a:b:c =0.53:1:0.8688

Cell Dimensions:

a = 6.752, b = 12.739, c = 11.068, Z = 4; beta = 100.37° V = 936.45 Den(Calc)= 4.33

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

{010} Perfect, {100} Good, {001} Good

Color:

Violet.

Density:

4.15

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Johillerite

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

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

Electron Density:

Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Johillerite =4.15 gm/cc.

Fermion Index:

Fermion Index = 0.0099134207
Boson Index = 0.9900865793

Photoelectric:

PE_Johillerite= 34.09 barns/electron
U=PE_Johillerite x r_electron= 132.61 barns/cc.

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

Dana Class:

38.02.03.08 (38)Anhydrous Phosphates, etc

(38.02)(A+ B++)5 (XO4)3

(38.02.03)Alluaudite-Wyllieite Group (Alluaudite Subgroup)

38.02.03.01 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

38.02.03.02 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

38.02.03.03 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

38.02.03.04 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

38.02.03.05 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

38.02.03.06 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

38.02.03.07 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

38.02.03.08 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

38.02.03.09 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m

38.02.03.10 Yazganite! NaFe2(Mg,Mn)(AsO4)3•H2O C 2/c 2/m

38.02.03.11 IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/c 2/m

38.02.03.12 IMA2008-064! Na16Mn25Al8(PO4)30 Pc m

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

References:

NAME( Dana8) PHYS. PROP.(Dana8, CanMin, v 42, p 717) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Johillerite

Na(Mg,Zn)3Cu(AsO4)3
Dana No: 38.02.03.08 Strunz No: 08.AC.10
Locality:

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