Johillerite Mineral Data

Johillerite Mineral Data +

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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.

Synonym:

ICSD 63284

PDF 35-522

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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 - PrismaticH-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),

Crystal Structure:

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Tait K T , Hawthorne F C , The Canadian Mineralogist , 42 (2004) p.717-722, Johillerite from Tolbachik, Kamchatka Peninsula, Russia: Crystal-structure, refinement and chemical composition, Locality: Tolbachik, Kamchatka Peninsula, Russia

View Additional jPOWD Structure files for Johillerite
[1]

Physical Properties of Johillerite

Cleavage:

[010] Perfect, [100] Good, [001] Good

Color:

Violet.

Density:

4.15

Diaphaniety:

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

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:

r_electron=3.89 gm/cc
note: r_Johillerite=4.15 gm/cc.

Fermion Index

Fermion Index = 0.00991
Boson Index = 0.99009

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)

Estimated Radioactivity from Johillerite - barely detectable

Johillerite Classification

Dana Class:

38.2.3.8 (38)Anhydrous Phosphates, etc

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

(38.2.3)Alluaudite-Wyllieite Group (Alluaudite Subgroup)

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

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

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

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

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

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

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

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

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

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

Strunz Class:

VII/A.07-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.07 - Johillerite - Nickenichite series

VII/A.07-10 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

VII/A.07-15 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

VII/A.07-20 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

VII/A.07-30 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Johillerite

Na(Mg,Zn)3Cu(AsO4)3
Dana No: 38.2.3.8 Strunz No: VII/A.07-10
Locality:

Notes: