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Tassieite Mineral Data

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General Tassieite Information

Help on Chemical  Formula: Chemical Formula: (Na,[ ])Ca2(Mg,Fe++,Fe+++)2(Fe+++,Mg)2(Fe++,Mg)2(PO4)6(H2O)2
Help on Composition: Composition: Molecular Weight = 955.32 gm
   Sodium       1.44 %  Na    1.95 % Na2O
   Calcium      8.22 %  Ca   11.51 % CaO
   Yttrium      0.19 %  Y     0.24 % Y2O3
   Ytterbium    0.18 %  Yb    0.21 % Yb2O3
   Magnesium    6.59 %  Mg   10.93 % MgO
   Manganese    0.29 %  Mn    0.37 % MnO
   Iron        19.70 %  Fe   14.89 % FeO / 11.62 % Fe2O3
   Phosphorus  19.39 %  P    44.43 % P2O5
   Hydrogen     0.42 %  H     3.77 % H2O
   Sulfur       0.03 %  S     0.08 % SO3
   Oxygen      43.54 %  O
              ______        ______ 
              100.00 %       99.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.6Ca1.96Mg2.59Mn2+0.05Fe2+1.98Fe3+1.39Y0.02Yb0.01S0.01P5.98O24�2(H2O)
Help on Environment: Environment: Secondary mineral in a nodule of fluoroapatite in a bioitite-quartz-plagioclase paragneiss. Wicksite group.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Johnston Fjord, Stornes Peninsula, Larsemann Hills, Prydz Bay, East Antarctica Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Tassie Tarn, a nearby lake at the locality.
Help on Synonym: Synonym: IMA2005-051

Tassieite Image

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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

Tassieite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0745:1:1.0995
Help on Cell Dimensions: Cell Dimensions: a = 12.4595, b = 11.5955, c = 12.7504, Z = 4; V = 1,842.10 Den(Calc)= 3.44
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: 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),

Physical Properties of Tassieite

Help on Cleavage: Cleavage: {100} Perfect, {1kl} Distinct
Help on Color: Color: Dark green.
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: very light green

Optical Properties of Tassieite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.208,KC= 0.2099
Ncalc = 1.72
Help on Optical Data: Optical Data: Biaxial (+), a=1.712, b=1.713, g=1.722, bire=0.0100, 2V(Calc)=38, 2V(Meas)=46. Dispersion very weak.

Calculated Properties of Tassieite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Tassieite =3.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETassieite = 9.90 barns/electron
U=PETassieite x relectron= 33.45 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 189.73 (Gamma Ray American Petroleum Institute Units)
Concentration of Tassieite per GRapi unit = 0.53 (%)

Estimated Radioactivity from Tassieite - barely detectable


Tassieite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.10)Dana Group Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6•2(H2O) Pcab 2/m 2/m 2/m 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
Help on  Strunz Class: Strunz Class: 08.CF.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CF -With large and medium-sized cations, RO4:H2O > 1:1
08.CF.05 Grischunite NaCa2Mn5Fe(AsO4)6•2(H2O) Pcab 2/m 2/m 2/m
08.CF.05 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m
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
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

Other Tassieite Information

Help on References: References: NAME( AmMin, v92:1778) PHYS. PROP.(AmMin, v92:1778) OPTIC PROP.(AmMin, v92:1778)
Help on See Also: 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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Print or Cut-and-Paste your Tassieite Specimen Label here :


(Na,[ ])Ca2(Mg,Fe++,Fe+++)2(Fe+++,Mg)2(Fe++,Mg)2(PO4)6(H2O)2
Dana No: Strunz No: 08.CF.05





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