Whiteite-(CaFeMg) Mineral Data

Whiteite-(CaFeMg) Mineral Data +

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General Whiteite-(CaFeMg) Information

Chemical Formula:

Ca(Fe++,Mn++)Mg2Al2(PO4)4(OH)2·8(H2O)

Composition:

Molecular Weight = 756.29 gm

Calcium 5.30 % Ca 7.41 % CaO

Magnesium 6.43 % Mg 10.66 % MgO

Manganese 1.82 % Mn 2.34 % MnO

Aluminum 7.14 % Al 13.48 % Al₂O₃

Iron 5.54 % Fe 7.12 % FeO

Phosphorus 16.38 % P 37.54 % P₂O₅

Hydrogen 2.40 % H 21.44 % H₂O

Oxygen 55.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺_0.75Mn²⁺_0.25Mg₂Al₂(PO₄)₄(OH)₂·8(H₂O)

Environment:

Found in pegmatites.

IMA Status:

Approved IMA 1978

Locality:

Lavra da Ilha, Itinga, 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.

Whiteite-(CaFeMg) Image

Images:

Whiteite-(CaFeMg)

Comments: Blocky, beige-pink whiteite-(CaFeMg) crystals on matrix.
Location: Cross-cut Creek, Yukon Territory, Canada. Scale: Crystal size 2x3x3.5 cm.
© Dave Barthelmy

Whiteite-(CaFeMg) Crystallography

Axial Ratios:

a:b:c =2.1346:1:1.4512

Cell Dimensions:

a = 14.9, b = 6.98, c = 10.13, Z = 2; beta = 113.12° V = 968.92 Den(Calc)= 2.59

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 9.27(1), 2.781(0.8), 2.941(0.7),

Physical Properties of Whiteite-(CaFeMg)

Cleavage:

[???] Perfect

Color:

Yellow, Yellow brown.

Density:

2.58

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Whiteite-(CaFeMg)

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2259,KPDmeas= 0.2267,KC= 0.2244

Optical Data:

Biaxial (+), a=1.58, b=1.585, g=1.59, bire=0.0100, 2V(Calc)=88, 2V(Meas)=40-50.

Calculated Properties of Whiteite-(CaFeMg)

Electron Density:

r_electron=2.61 gm/cc
note: r_{Whiteite-(CaFeMg)}=2.59 gm/cc.

Fermion Index

Fermion Index = 0.00794
Boson Index = 0.99206

Photoelectric:

PE_{Whiteite-(CaFeMg)}= 3.87 barns/electron
U=PE_{Whiteite-(CaFeMg)} x r_electron= 10.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Whiteite-(CaFeMg) is Not Radioactive

Whiteite-(CaFeMg) Classification

Dana Class:

42.11.3.1 (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.29-10 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-(CaFeMg) Information

References:

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

See Also:

Links to other databases for Whiteite-(CaFeMg) :
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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Print or Cut-and-Paste your Whiteite-(CaFeMg) Specimen Label here :

Whiteite-(CaFeMg)

Ca(Fe++,Mn++)Mg2Al2(PO4)4(OH)2·8(H2O)
Dana No: 42.11.3.1 Strunz No: VII/D.29-10
Locality:

Notes: