Jouravskite Mineral Data
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 % H2 O
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:
Ca3 Mn4+ (SO4 )1.5 (CO3 )0.5 (OH)6 •12(H2 O)
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.
Name Pronunciation:
Jouravskite + Pronunciation
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 - Dipyramidal H-M Symbol (6/m) Space Group: P 63 /m
X Ray Diffraction:
By Intensity(I/Io ): 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
Diaphaneity:
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 Ncalc = 1.55 - 1.56
Optical Data:
Uniaxial (-), e=1.54, w=1.556, bire=0.0160.
Calculated Properties of Jouravskite
Electron Density:
Bulk Density (Electron Density)=2.02 gm/cc note: Specific Gravity of Jouravskite =1.95 gm/cc.
Fermion Index:
Fermion Index = 0.0011827535 Boson Index = 0.9988172465
Photoelectric:
PEJouravskite = 4.68 barns/electronU=PEJouravskite x r Electron Density= 9.46 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Jouravskite is Not Radioactive
Jouravskite Classification
Dana Class:
32.04.04.03 (32) Compound Sulfates
(32.04) (hydrous) with poly-anionic formula
(32.04.04) Charlesite Group
32.04.04.01 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31 c 3m
32.04.04.02 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31 c 3m
32.04.04.03 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63 /m 6/m
32.04.04.04 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63 /m 6/m
32.04.04.05 Carraraite ! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63 /m, or P 63 Hex
Strunz Class:
07.DG.15 07 - SULFATES (SELENATES, TELLURATES)
07.D - Sulfates (selenates, etc.) with additional anions, with H2O
07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63 /mmc 6/m 2/m 2/m
07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31 c 3m
07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63 /mmc 6/m 2/m 2/m
07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63 /m 6/m
07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31 c 3m
07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63 /m 6/m
07.DG.15 Buryatite ! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31 c 3m
07.DG.15 Carraraite ! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63 /m, or P 63 Hex
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 - 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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Jouravskite
Ca3Mn++++(SO4,CO3)2(OH)6•12(H2O)
Dana No: 32.04.04.03 Strunz No: 07.DG.15
Locality:
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