Whiteite-(CaMnMg) Mineral Data

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.

Whiteite-(CaMnMg) Image

Images:

Click Here for Larger Whiteite-(CaMnMg) Image

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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=2.62 gm/cc
note: r_{Whiteite-(CaMnMg)}=2.60 gm/cc.

Fermion Index

Fermion Index = 0.00677
Boson Index = 0.99323

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Whiteite-(CaMnMg) is Not Radioactive

Whiteite-(CaMnMg) Classification

Dana Class:

42.11.3.3 (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.29-20 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-(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 -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-(CaMnMg)

CaMn++Mg2Al2(PO4)4(OH)2·8(H2O)
Dana No: 42.11.3.3 Strunz No: VII/D.29-20
Locality:

Notes: