Whiteite-(CaMnMg) Mineral Data

General Whiteite-(CaMnMg) Information

Chemical Formula:

CaMn++Mg2Al2(PO4)4(OH)2•8(H2O)

Composition:

Molecular Weight = 755.61 gm

Calcium 5.30 % Ca 7.42 % CaO

Magnesium 6.43 % Mg 10.67 % MgO

Manganese 7.27 % Mn 9.39 % MnO

Aluminum 7.14 % Al 13.49 % Al₂O₃

Phosphorus 16.40 % P 37.57 % P₂O₅

Hydrogen 2.40 % H 21.46 % H₂O

Oxygen 55.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺Mg₂Al₂(PO₄)₄(OH)₂•8(H₂O)

Environment:

In a pegmatite.

IMA Status:

Approved IMA 1978

Locality:

Tip Top pegmatite, Custer, Custer County, South Dakota, USA. 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-(CaMnMg)

Whiteite-(CaMnMg) Image

Images:

Whiteite-(CaMnMg) Lazulite

Comments: Light beige-colored whiteite-(CaMnMg) crystal perched on dark blue lazulite.
Location: Rapid Creek, Yukon Territory, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Whiteite-(CaMnMg) Crystallography

Axial Ratios:

a:b:c =2.1275:1:1.4491

Cell Dimensions:

a = 14.842, b = 6.976, c = 10.109, Z = 2; beta = 112.59° V = 966.36 Den(Calc)= 2.60

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 9.31(1), 2.79(0.8), 4.85(0.5),

Physical Properties of Whiteite-(CaMnMg)

Cleavage:

{???} Indistinct

Color:

Greenish yellow, Yellow, Light lilac, Pink.

Density:

2.63

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Whiteite-(CaMnMg)

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.225,KPDmeas= 0.2224,KC= 0.2251
Ncalc = 1.59

Optical Data:

Biaxial (+), a=1.58, b=1.584, g=1.591, bire=0.0110, 2V(Calc)=76, 2V(Meas)=74-81.

Calculated Properties of Whiteite-(CaMnMg)

Electron Density:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Whiteite-(CaMnMg) =2.60 gm/cc.

Fermion Index:

Fermion Index = 0.0067726593
Boson Index = 0.9932273407

Photoelectric:

PE_{Whiteite-(CaMnMg)}= 3.62 barns/electron
U=PE_{Whiteite-(CaMnMg)} x rElectron Density= 9.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Whiteite-(CaMnMg) is Not Radioactive

Whiteite-(CaMnMg) Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq ï¿½ 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-(CaMnMg) Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p933,1990) OPTIC PROP.(Am.Min.,Vol.75,p933,1990)

See Also:

Links to other databases for Whiteite-(CaMnMg) :
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-(CaMnMg)

CaMn++Mg2Al2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.03.03 Strunz No: 08.DH.15
Locality:

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