Tassieite Mineral Data (original) (raw)
General Tassieite Information
Chemical Formula:
(Na,[ ])Ca2(Mg,Fe++,Fe+++)2(Fe+++,Mg)2(Fe++,Mg)2(PO4)6(H2O)2
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
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
Tassieite Image
Images:
 |
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
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 - DipyramidalH-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),
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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| | Grew E S , Armbruster T , Medenbach O , Yates M G , Carson C J , The Canadian Mineralogist , 45 (2007) p.293-305 | | ------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Tassieite
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
Optical Properties of Tassieite
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.
Calculated Properties of Tassieite
Electron Density:
Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Tassieite =3.44 gm/cc.
Fermion Index:
Fermion Index = 0.01
Boson Index = 0.99
Photoelectric:
PETassieite = 9.90 barns/electron
U=PETassieite x relectron= 33.45 barns/cc.
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
Dana Class:
40.02.10.03 (40)Hydrated Phosphates, etc
(40.02)where A++ (B++)2 (XO4) � x(H2O)
(40.02.10)Dana Group
40.02.10.01 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m
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
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
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
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: