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Tassieite Mineral Data
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General Tassieite Information
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 Chemical Formula: |
(Na,[ ])Ca2(Mg,Fe++,Fe+++)2(Fe+++,Mg)2(Fe++,Mg)2(PO4)6(H2O)2 |
| Composition: |
Molecular Weight = 955.32 gm |
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Sodium 1.44 % Na 1.95 % Na2O |
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Calcium 8.22 % Ca 11.51 % CaO |
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Yttrium 0.19 % Y 0.24 % Y2O3 |
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Ytterbium 0.18 % Yb 0.21 % Yb2O3 |
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Magnesium 6.59 % Mg 10.93 % MgO |
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Manganese 0.29 % Mn 0.37 % MnO |
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Iron 19.70 % Fe 14.89 % FeO / 11.62 % Fe2O3 |
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Phosphorus 19.39 % P 44.43 % P2O5 |
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Hydrogen 0.42 % H 3.77 % H2O |
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Sulfur 0.03 % S 0.08 % SO3 |
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Oxygen 43.54 % O |
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______ ______ |
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100.00 % 99.98 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.6Ca1.96Mg2.59Mn2+0.05Fe2+1.98Fe3+1.39Y0.02Yb0.01S0.01P5.98O24�2(H2O) |
| Environment: |
Secondary mineral in a nodule of fluoroapatite in a bioitite-quartz-plagioclase paragneiss. Wicksite group. |
| IMA Status: |
Approved IMA 2005 (Dana # Added) |
| Locality: |
Johnston Fjord, Stornes Peninsula, Larsemann Hills, Prydz Bay, East Antarctica Link to MinDat.org Location Data. |
| Name Origin: |
Named for Tassie Tarn, a nearby lake at the locality. |
| Synonym: |
IMA2005-051 |
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Tassieite Image |
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Images:
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Tassieite
Comments: Thin-section image in plane-polarized light of bluish gray tassieite in a band of alteration (abundant particles) cutting fluorapatite (Ap). Inset image illustrates cleavage.
Location: Granulite-facies paragneiss from Stornes Peninsula, Larsemann Hills, Pyrdz Bay, East Antarctica. (CanMin, v45:293).
Scale: See Image.
© Canadian Mineralogist |
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Tassieite Crystallography
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| Axial Ratios: |
a:b:c =1.0745:1:1.0995 |
| Cell Dimensions: |
a = 12.4595, b = 11.5955, c = 12.7504, Z = 4; V = 1,842.10 Den(Calc)= 3.44 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca |
| X Ray Diffraction: |
By Intensity(I/Io): 2.735(1), 2.895(0.8), 3(0.8),3.497(0.4), 2.091(0.3), 2.545(0.1), 6.4(0.05), |
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Physical Properties of Tassieite
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| Cleavage: |
{100} Perfect, {1kl} Distinct |
| Color: |
Dark green. |
| Diaphaneity: |
Transparent to translucent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
very light green |
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Optical Properties of Tassieite
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| Gladstone-Dale: |
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.208,KC= 0.2099
Ncalc = 1.72 |
| Optical Data: |
Biaxial (+), a=1.712, b=1.713, g=1.722, bire=0.0100, 2V(Calc)=38, 2V(Meas)=46. Dispersion very weak. |
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Calculated Properties of Tassieite
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| Electron Density: |
Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Tassieite =3.44 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PETassieite = 9.90 barns/electron
U=PETassieite x relectron= 33.45 barns/cc.
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| Radioactivity: |
GRapi = 189.73 (Gamma Ray American Petroleum Institute Units)
Concentration of Tassieite per GRapi unit = 0.53 (%)
Estimated Radioactivity from Tassieite  - barely detectable
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Tassieite Classification
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| Dana Class: |
40.02.10.03 (40)Hydrated Phosphates, etc |
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(40.02)where A++ (B++)2 (XO4) � x(H2O) |
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(40.02.10)Dana Group |
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40.02.10.01 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m |
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40.02.10.02 Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6•2(H2O) Pcab 2/m 2/m 2/m |
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40.02.10.03 Tassieite! (Na,[])Ca2(Mg,Fe,Fe)2(Fe,Mg)2(Fe,Mg)2(PO4)6(H2O)2 P bca 2/m 2/m 2/m |
| Strunz Class: |
08.CF.05 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CF -With large and medium-sized cations, RO4:H2O > 1:1 |
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08.CF.05 Grischunite NaCa2Mn5Fe(AsO4)6•2(H2O) Pcab 2/m 2/m 2/m |
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08.CF.05 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m |
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08.CF.05 Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6•2(H2O) Pcab 2/m 2/m 2/m |
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08.CF.05 Tassieite! (Na,[])Ca2(Mg,Fe,Fe)2(Fe,Mg)2(Fe,Mg)2(PO4)6(H2O)2 P bca 2/m 2/m 2/m |
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Other Tassieite Information
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| References: |
NAME( AmMin, v92:1778) PHYS. PROP.(AmMin, v92:1778) OPTIC PROP.(AmMin, v92:1778) |
| See Also: |
Links to other databases for Tassieite :
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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Tassieite
(Na,[ ])Ca2(Mg,Fe++,Fe+++)2(Fe+++,Mg)2(Fe++,Mg)2(PO4)6(H2O)2
Dana No: 40.02.10.03 Strunz No: 08.CF.05
Locality:
Notes:
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