Whiteite-(MnFeMg) Mineral Data
General Whiteite-(MnFeMg) Information
Chemical Formula:
(Mn++,Ca)(Fe++,Mn++)Mg2Al2(PO4)4(OH)2•8(H2O)
Composition:
Molecular Weight = 767.44 gm
Calcium 1.31 % Ca 1.83 % CaO
Magnesium 6.33 % Mg 10.50 % MgO
Manganese 7.16 % Mn 9.24 % MnO
Aluminum 7.03 % Al 13.29 % Al2 O3
Iron 5.46 % Fe 7.02 % FeO
Phosphorus 16.14 % P 36.99 % P2 O5
Hydrogen 2.36 % H 21.13 % H2 O
Oxygen 54.20 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mn2+ 0.75 Ca0.25 Fe2+ 0.75 Mn2+ 0.25 Mg2 Al2 (PO4 )4 (OH)2 �8(H2 O)
Environment:
In pegmatites.
IMA Status:
Approved IMA 1978
Locality:
Ilha de Taquaral, Minas Gerias, Brazil. Link to MinDat.org Location Data.
Name Origin:
Named for John S. White, Jr. (1933-), former editor of the Mineralogical Record and professional curator of minerals and gems.
Name Pronunciation:
Whiteite-(MnFeMg)
Whiteite-(MnFeMg) Image
Images:
Whiteite-(MnFeMg)
Comments: Spherical micro crystalline aggregates of whiteite- (MnFeMg) on matrix to 0.3 mm.
Location: Foote Mine, Kings Mtn. Dist., Cleveland Co., North Carolina, USA.
Scale: Specimen Size 2 x 1 x 1 cm.
© Tom Loomis / Dakota Matrix
Whiteite-(MnFeMg) Crystallography
Axial Ratios:
a:b:c =2.1537:1:1.4568
Cell Dimensions:
a = 14.99, b = 6.96, c = 10.14, Z = 2; beta = 113.32° V = 971.49 Den(Calc)= 2.62
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
X Ray Diffraction:
By Intensity(I/Io ): 9.32(1), 2.78(0.9), 2.95(0.5), 4.82(0.5), 3.25(0.4), 3.52(0.4), 1.64(0.4), 5.6(0.3),
Physical Properties of Whiteite-(MnFeMg)
Cleavage:
{???} Good
Color:
Chocolate brown.
Density:
2.63 - 2.67, Average = 2.65
Diaphaneity:
Transparent
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
brownish white
Optical Properties of Whiteite-(MnFeMg)
Gladstone-Dale:
CI meas = 0.011 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2233,KPDmeas = 0.2208,KC = 0.2233 Ncalc = 1.58 - 1.6
Optical Data:
Biaxial (+), a=1.58, b=1.584-1.585, g=1.59-1.591, bire=0.0100-0.0110
Calculated Properties of Whiteite-(MnFeMg)
Electron Density:
Bulk Density (Electron Density)=2.63 gm/cc note: Specific Gravity of Whiteite-(MnFeMg) =2.62 gm/cc.
Fermion Index:
Fermion Index = 0.0077724659 Boson Index = 0.9922275341
Photoelectric:
PEWhiteite-(MnFeMg) = 4.67 barns/electronU=PEWhiteite-(MnFeMg) x r Electron Density= 12.30 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Whiteite-(MnFeMg) is Not Radioactive
Whiteite-(MnFeMg) Classification
Dana Class:
42.11.03.02 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.11) where (AB)4 (XO4)3 Zq � x(H2O)
(42.11.03) Whiteite Group
42.11.03.01 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21 /a 2/m
42.11.03.02 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
42.11.03.03 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
42.11.03.04 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m
42.11.03.05 Jahnsite-(CaFeFe) ! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
42.11.03.06 Jahnsite-(NaFeMg) ! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
42.11.03.07 Jahnsite-(CaMgMg) ! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
42.11.03.08 Jahnsite-(NaMnMg) ! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
Strunz Class:
08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21 /a 2/m
08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(MnMnMn) * MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Kaluginite * (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m
08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m
08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21 /a 2/m
08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(CaFeFe) ! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
08.DH.15 Jahnsite-(NaFeMg) ! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
08.DH.15 Jahnsite-(CaMgMg) ! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
08.DH.15 Jahnsite-(NaMnMg) ! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
Other Whiteite-(MnFeMg) Information
References:
NAME( Dana8) PHYS. PROP.(Dana8)
See Also:
Links to other databases for Whiteite-(MnFeMg) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Whiteite-(MnFeMg)
(Mn++,Ca)(Fe++,Mn++)Mg2Al2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.03.02 Strunz No: 08.DH.15
Locality:
Notes:
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