Zodacite Mineral Data
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 % Fe2 O3
Phosphorus 14.38 % P 32.94 % P2 O5
Hydrogen 2.18 % H 19.51 % H2 O
Oxygen 49.51 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca4 Mn2+ Fe3+ 4 (PO4 )6 (OH)4 •12(H2 O)
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.
Name Pronunciation:
Zodacite
Zodacite Image
Images:
Zodacite
Comments: SEM image of a divergent spray of zodacite crystals. (AmMin, v73:1179).
Location: Mangualde, Portugal.
Scale: See Image.
© American Mineralogist
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:
Monoclinic Space Group: C 2/c,Cc
X Ray Diffraction:
By Intensity(I/Io ): 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
Diaphaneity:
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 Ncalc = 1.67 - 1.7
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:
Bulk Density (Electron Density)=2.68 gm/cc note: Specific Gravity of Zodacite =2.68 gm/cc.
Fermion Index:
Fermion Index = 0.0040719072 Boson Index = 0.9959280928
Photoelectric:
PEZodacite = 8.34 barns/electronU=PEZodacite x r Electron Density= 22.37 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Zodacite is Not Radioactive
Zodacite Classification
Dana Class:
42.11.08.04 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.11) where (AB)4 (XO4)3 Zq � x(H2O)
(42.11.08) Montgomeryite group
42.11.08.01 Montgomeryite Ca4MgAl4(PO4)6(OH)4•12(H2O) C 2/c 2/m
42.11.08.02 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4•12(H2O) C 2 2
42.11.08.03 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4•12(H2O) C 2 2
42.11.08.04 Zodacite Ca4MnFe4(PO4)6(OH)4•12(H2O) C 2/c,Cc Mono
42.11.08.05 Angastonite ! CaMgAl2(PO4)2(OH)4?7H2O P1 1
Strunz Class:
08.DH.25 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.25 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4•12(H2O) C 2 2
08.DH.25 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4•12(H2O) C 2 2
08.DH.25 Montgomeryite Ca4MgAl4(PO4)6(OH)4•12(H2O) C 2/c 2/m
08.DH.25 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Zodacite
Ca4Mn++Fe+++4(PO4)6(OH)4•12(H2O)
Dana No: 42.11.08.04 Strunz No: 08.DH.25
Locality:
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