Jouravskite Mineral Data

Jouravskite Mineral Data +

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General Jouravskite Information

Chemical Formula:

Ca3Mn++++(SO4,CO3)2(OH)6·12(H2O)

Composition:

Molecular Weight = 667.50 gm

Calcium 18.01 % Ca 25.20 % CaO

Manganese 8.23 % Mn 13.02 % MnO₂

Hydrogen 4.53 % H 40.48 % H₂O

Carbon 0.90 % C 3.30 % CO₂

Sulfur 7.21 % S 17.99 % SO₃

Oxygen 61.12 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Mn⁴⁺(SO₄)_1.5(CO₃)_0.5(OH)₆·12(H₂O)

Environment:

Secondary mineral found on other manganese minerals.

IMA Status:

Approved IMA 1965

Locality:

Tachgagalt No. 2 vein, Anti Atlas, Morocco. Link to MinDat.org Location Data.

Name Origin:

Named for Georges Jouravsky (1896-1964), chief geologist, Division de la Geologie du Maroc.

Synonym:

ICSD 26187

PDF 18-668

Jouravskite Image

Images:

Jouravskite

Comments: Lemon yellow granular jouravskite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 3.3 x 2.1 cm.
© John Veevaert

Jouravskite Crystallography

Axial Ratios:

a:c = 1:0.94936

Cell Dimensions:

a = 11.06, c = 10.5, Z = 2; V = 1,112.32 Den(Calc)= 1.99

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 9.6(1), 3.81(0.6), 5.53(0.6),

Physical Properties of Jouravskite

Cleavage:

[100] Good

Color:

Green orange, Greenish yellow.

Density:

1.95

Diaphaniety:

Transparent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Jouravskite

Dichroism (e):

green.

Dichroism (w):

russet.

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2754,KPDmeas= 0.281,KC= 0.2807

Optical Data:

Uniaxial (-), e=1.54, w=1.556, bire=0.0160.

Calculated Properties of Jouravskite

Electron Density:

r_electron=2.02 gm/cc
note: r_Jouravskite=1.95 gm/cc.

Fermion Index

Fermion Index = 0.00118
Boson Index = 0.99882

Photoelectric:

PE_Jouravskite= 4.68 barns/electron
U=PE_Jouravskite x r_electron= 9.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jouravskite is Not Radioactive

Jouravskite Classification

Dana Class:

32.4.4.3 (32)Compound Sulfates

(32.4)(hydrous) with poly-anionic formula

(32.4.4)Dana Group

32.4.4.1 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12·26(H2O) P 3₁c 3m

32.4.4.2 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12·25(H2O) P 3₁c 3m

32.4.4.3 Jouravskite Ca3Mn(SO4,CO3)2(OH)6·12(H2O) P 6₃/m 6/m

32.4.4.4 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

32.4.4.5 Carraraite! Ca3Ge(OH)6(SO4)(CO3)·12H2O P 6₃/m, or P 6₃ Hex

Strunz Class:

VI/D.13-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.13 - Ettringite group, Ettringite - Sturmanite

VI/D.13-10 Ettringite Ca6Al2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.13-20 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.13-30 Jouravskite Ca3Mn(SO4,CO3)2(OH)6·12(H2O) P 6₃/m 6/m

VI/D.13-35 Carraraite! Ca3Ge(OH)6(SO4)(CO3)·12H2O P 6₃/m, or P 6₃ Hex

VI/D.13-40 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12·26(H2O) P 3₁c 3m

VI/D.13-50 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12·25(H2O) P 3₁c 3m

VI/D.13-60 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6·12(H2O) P 3₁c 3m

Other Jouravskite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Jouravskite :
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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Jouravskite

Ca3Mn++++(SO4,CO3)2(OH)6·12(H2O)
Dana No: 32.4.4.3 Strunz No: VI/D.13-30
Locality:

Notes: