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Tassieite

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Formula:
(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2O
Colour:
dark green
Lustre:
Vitreous
Specific Gravity:
3.45 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named for type locality, Tassie Tarn, Stornes Peninsula, Larsemann Hills, Antarctica
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Classification of TassieiteHide

Approved
Approval Year:
2006
8.CF.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
40.2.16.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O

Physical Properties of TassieiteHide

Vitreous
Transparency:
Transparent
Colour:
dark green
Streak:
light green
Tenacity:
Brittle
Cleavage:
Perfect
good to perfect on {100}; a second intersects this at an angle of 60°
Density:
3.45 g/cm3 (Calculated)

Optical Data of TassieiteHide

Type:
Biaxial (+)
RI values:
nα = 1.712(2) nβ = 1.713(2) nγ = 1.722(2)
2V:
Measured: 46° (1), Calculated: 37°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
very weak
Pleochroism:
Visible
Comments:
X dark blue, Y blue, Z light brown

Chemical Properties of TassieiteHide

Formula:
(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2O
IMA Formula:
NaCa2Mg3Fe2+2Fe3+(PO4)6 · 2H2O

Crystallography of TassieiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 12.4595(7) Å, b = 11.5955(16) Å, c = 12.7504(7) Å
Ratio:
a:b:c = 1.075 : 1 : 1.1
Unit Cell V:
1842.1 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.40(5)
3.497(40)
3.000(80)
2.895(80)
2.735(100)
2.545(10)
2.091(30)

Type Occurrence of TassieiteHide

General Appearance of Type Material:
A few larger grains of tassieite (i.e., 0.5–1 mm) show crystal faces and cleavage traces, but most grains, which are 0.02 to 0.3 mm in longest dimension, are platy and anhedral
Place of Conservation of Type Material:
Holotype material (sample no. 113002A) is deposited in the National Museum of Natural History (Smithsonian Institution) as catalogue number NMNH 174436, the same as the holotype specimen for stornesite-(Y).
Geological Setting of Type Material:
occurs in a single, rounded nodule ~8–10 cm across of dark brown fluorapatite in biotite – quartz – plagioclase paragneiss
Associated Minerals at Type Locality:

Synonyms of TassieiteHide

Other Language Names for TassieiteHide

Simplified Chinese:镁魏磷石

Relationship of Tassieite to other SpeciesHide

Member of:
Other Members of this group:
BederiteCa2(Mn2+)4(Fe3+)2(PO4)6 · 2H2OOrth.
GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.
Maneckiite(Na◻)Ca2Fe2+2(Fe3+Mg)Mn2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Nickel-Strunz GroupingHide

8.CF.05GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.
8.CF.05WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CF.05BederiteCa2(Mn2+)4(Fe3+)2(PO4)6 · 2H2OOrth.
8.CF.10HaigerachiteKFe3+3(HPO4)2(H2PO4)6 · 4H2OMon. 2/m : B2/b

Fluorescence of TassieiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TassieiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grew, E.S., Armbruster, T., Medenbach, O., Yates, M.G., Carson, C.J. (2006): Tassieite, (Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe3+,Mg)2(Fe2+,Mg)2(PO4)6•2H2O, a hydrothermal wicksite-group mineral in fluorapatite nodules from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica. Canadian Mineralogist, 45, 293-305(2007).

Internet Links for TassieiteHide

Localities for TassieiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica (TL)
 
  • Eastern Antarctica
    • Princess Elizabeth Land
      • Ingrid Christensen Coast
        • Prydz Bay
          • Larsemann Hills (Larseman Hills)
            • Stornes Peninsula
Canadian Mineralogist 45,293(2007); Grew, E.S., Armbruster, T., Medenbach, O., Yates, M.G., Carson, C.J. (2006): Tassieite, (Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe3+,Mg)2(Fe2+,Mg)2(PO4)6•2H2O, a hydrothermal wicksite-group mineral in fluorapatite nodules from granulite-facies paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica. Canadian Mineralogist, 45, 293-305(2007).
Mineral and/or Locality  
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