Calcioferrite Mineral Data

Calcioferrite Mineral Data +

General Calcioferrite Information

Chemical Formula:

Ca4Fe++(Fe+++,Al)4(PO4)6(OH)4·12(H2O)

Composition:

Molecular Weight = 1,233.18 gm

Calcium 13.00 % Ca 18.19 % CaO

Magnesium 1.97 % Mg 3.27 % MgO

Aluminum 2.19 % Al 4.13 % Al₂O₃

Iron 13.59 % Fe 19.42 % Fe₂O₃

Phosphorus 15.07 % P 34.53 % P₂O₅

Hydrogen 2.29 % H 20.45 % H₂O

Oxygen 51.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

·12(H₂O)Ca₄MgFe³⁺₃Al(PO₄)₆(OH)₄

Environment:

Found in a bed of Tertiary clay. The Fe-analog of montgomeryite.

IMA Status:

Valid Species (Pre-IMA) 1858

Locality:

Battenberg, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for its composition.

Calcioferrite Image

Images:

Calcioferrite

Comments: Whitish green botryoidal crust of calcioferrite on matrix.
Location: Brugues, Barcelona, Catalunya, Spain. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Calcioferrite Crystallography

Axial Ratios:

a:b:c =0.4272:1:0.2607

Cell Dimensions:

a = 10.34, b = 24.2, c = 6.31, Z = 2; beta = 91.5° V = 1,578.40 Den(Calc)= 2.59

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 12.1(1), 1.578(0.9), 2.59(0.9),2.65(0.9), 2.9(0.9), 3.15(0.7), 5.17(0.6), 6.05(0.6),

Physical Properties of Calcioferrite

Cleavage:

[???] Perfect, [???] Very Good

Color:

Greenish yellow, Yellow, Yellow green, Yellowish white.

Density:

2.53

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Foliated - Two dimensional platy forms.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

2.5 - Finger Nail

Luster:

Pearly

Streak:

yellowish white

Optical Properties of Calcioferrite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2232,KPDmeas= 0.2285,KC= 0.2472

Optical Data:

Biaxial (-), a=1.572, b=1.579, g=1.583, bire=0.0110, 2V(Calc)=72, 2V(Meas)=75.

Calculated Properties of Calcioferrite

Electron Density:

r_electron=2.55 gm/cc
note: r_{Calcioferrite}=2.53 gm/cc.

Fermion Index

Fermion Index = 0.00527
Boson Index = 0.99473

Photoelectric:

PE_{Calcioferrite}= 6.39 barns/electron
U=PE_{Calcioferrite} x r_electron= 16.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Calcioferrite is Not Radioactive

Calcioferrite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.8)Dana Group

42.11.8.1 Montgomeryite Ca4MgAl4(PO4)6(OH)4·12(H2O) C 2/c 2/m

42.11.8.2 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4·12(H2O) C 2 2

42.11.8.3 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4·12(H2O) C 2 2

42.11.8.4 Zodacite Ca4MnFe4(PO4)6(OH)4·12(H2O) C 2/c,Cc Mono

Strunz Class:

VII/D.31-30 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.31 - Montgomeryite group

VII/D.31-10 Montgomeryite Ca4MgAl4(PO4)6(OH)4·12(H2O) C 2/c 2/m

VII/D.31-20 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4·12(H2O) C 2 2

VII/D.31-30 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4·12(H2O) C 2 2

VII/D.31-40 Zodacite Ca4MnFe4(PO4)6(OH)4·12(H2O) C 2/c,Cc Mono

Other Calcioferrite Information

References:

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

See Also:

Links to other databases for Calcioferrite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Calcioferrite

Ca4Fe++(Fe+++,Al)4(PO4)6(OH)4·12(H2O)
Dana No: 42.11.8.3 Strunz No: VII/D.31-30
Locality:

Notes: