Whiteite-(MnFeMg) Mineral Data

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 % Al₂O₃

Iron 5.46 % Fe 7.02 % FeO

Phosphorus 16.14 % P 36.99 % P₂O₅

Hydrogen 2.36 % H 21.13 % H₂O

Oxygen 54.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.75Ca_0.25Fe²⁺_0.75Mn²⁺_0.25Mg₂Al₂(PO₄)₄(OH)₂·8(H₂O)

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.

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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 - PrismaticH-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 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

Diaphaniety:

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

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:

r_electron=2.63 gm/cc
note: r_{Whiteite-(MnFeMg)}=2.62 gm/cc.

Fermion Index

Fermion Index = 0.00777
Boson Index = 0.99223

Photoelectric:

PE_{Whiteite-(MnFeMg)}= 4.67 barns/electron
U=PE_{Whiteite-(MnFeMg)} x r_electron= 12.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Whiteite-(MnFeMg) is Not Radioactive

Whiteite-(MnFeMg) Classification

Dana Class:

42.11.3.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.3)Dana Group

42.11.3.1 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2₁/a 2/m

42.11.3.2 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

42.11.3.3 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

42.11.3.4 Rittmannite MnMnFeAl2(OH)2(PO4)4·8(H2O) P 2/a 2/m

Strunz Class:

VII/D.29-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.29 - Whiteite - Jahnsite group

VII/D.29-10 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2₁/a 2/m

VII/D.29-20 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-30 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-40 Rittmannite MnMnFeAl2(OH)2(PO4)4·8(H2O) P 2/a 2/m

VII/D.29-50 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-60 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-70 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-75 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-80 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3·2(H2O) P 2₁/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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Whiteite-(MnFeMg)

(Mn++,Ca)(Fe++,Mn++)Mg2Al2(PO4)4(OH)2·8(H2O)
Dana No: 42.11.3.2 Strunz No: VII/D.29-30
Locality:

Notes: