Zodacite Mineral Data

Zodacite Mineral Data +

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General Zodacite Information

Chemical Formula:

Ca4Mn++Fe+++4(PO4)6(OH)4·12(H2O)

Composition:

Molecular Weight = 1,292.68 gm

Calcium 12.40 % Ca 17.35 % CaO

Manganese 4.25 % Mn 5.49 % MnO

Iron 17.28 % Fe 24.71 % Fe₂O₃

Phosphorus 14.38 % P 32.94 % P₂O₅

Hydrogen 2.18 % H 19.51 % H₂O

Oxygen 49.51 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Mn²⁺Fe³⁺₄(PO₄)₆(OH)₄·12(H₂O)

IMA Status:

Approved IMA 1988

Locality:

Mangualde pegmatite, Beira, Portugal. Link to MinDat.org Location Data.

Name Origin:

Named for Peter Zodac (1894-1967), founder and editor of Rocks and Minerals.

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Zodacite Crystallography

Axial Ratios:

a:b:c =0.4205:1:0.2613

Cell Dimensions:

a = 10.152, b = 24.14, c = 6.308, Z = 2; beta = 91.14° V = 1,545.59 Den(Calc)= 2.78

Crystal System:

MonoclinicSpace Group: C 2/c,Cc

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

By Intensity(I/I_o): 5.18(1), 12(0.6), 2.907(0.5),

Physical Properties of Zodacite

Cleavage:

[010] Good

Color:

Light yellow, Medium yellow, Colorless.

Density:

2.68

Diaphaniety:

Transparent

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Zodacite

Gladstone-Dale:

CI meas= 0.11 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.142 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2159,KPDmeas= 0.224,KC= 0.2517

Optical Data:

Biaxial (-), a=1.598, b=1.601, g=1.602, bire=0.0040, 2V(Calc)=58, 2V(Meas)=83.

Pleochroism (x):

colorless.

Pleochroism (y):

very pale green.

Pleochroism (z):

pale green.

Calculated Properties of Zodacite

Electron Density:

r_electron=2.68 gm/cc
note: r_Zodacite=2.68 gm/cc.

Fermion Index

Fermion Index = 0.00407
Boson Index = 0.99593

Photoelectric:

PE_Zodacite= 8.34 barns/electron
U=PE_Zodacite x r_electron= 22.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zodacite is Not Radioactive

Zodacite Classification

Dana Class:

42.11.8.4 (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.31-40 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 Zodacite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p1179-1181,1988) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Zodacite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Zodacite

Ca4Mn++Fe+++4(PO4)6(OH)4·12(H2O)
Dana No: 42.11.8.4 Strunz No: VII/D.31-40
Locality:

Notes: