Stornesite-(Y) Mineral Data

Stornesite-(Y) Mineral Data
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General Stornesite-(Y) Information

Help on Chemical Formula: Chemical Formula: (Y, Ca)[ ]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36
Help on Composition: Composition: Molecular Weight = 5,318.15 gm
   Sodium       3.76 %  Na    5.06 % Na2O
   Strontium    0.02 %  Sr    0.02 % SrO
   Calcium      4.07 %  Ca    5.69 % CaO
   Yttrium      1.14 %  Y     1.44 % Y2O3
   Ytterbium    0.20 %  Yb    0.22 % Yb2O3
   Magnesium   14.04 %  Mg   23.27 % MgO
   Uranium      0.01 %  U     0.02 % UO2
   Manganese    0.19 %  Mn    0.24 % MnO
   Iron        12.14 %  Fe   15.62 % FeO
   Silicon      0.01 %  Si    0.02 % SiO2
   Phosphorus  21.10 %  P    48.34 % P2O5
   Sulfur       0.02 %  S     0.06 % SO3
   Oxygen      43.32 %  O
              ______        ______ 
              100.00 %      100.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.68Yb0.06U0.003Na8.69Ca5.4Sr0.01Mg30.71Fe2+11.56Mn2+0.18Si0.02S0.04P36.22O144
Help on Environment: Environment: Found as inclusions in fluorapatite nodules in two paragneiss specimens. Y-dominant analog of the meteoritic mineral chladniite. Fillowite group.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Johnston Fjord, Stornes Peninsula, Prydz Bay, East Antarctica Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA2005-040
 

Stornesite-(Y) Image

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Stornesite-(Y)

Comments: BSE image of stornesite-(Y) (Sto) partially surrounding a spherical quartz(Qz)-biotite(Bt) aggregate in apatite (Ap). Other mineral phases include xenotime (Xnt), sillmanite Sil) and corderite (Crd). AmMin, v91, p 1416.
Location: Paragneiss specimens from Johnston Fjord, Stornes Peninsula, Antarctica. Scale: See Image.
© American Mineralogist

Stornesite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.85748
Help on Cell Dimensions: Cell Dimensions: a = 14.9628, c = 42.756, Z = 3; V = 8,289.98 Den(Calc)= 3.20
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.73(1), 2.94(0.6), 1.84(0.4),3.52(0.4), 3.67(0.4), 2.47(0.3), 2.62(0.1), 3.18(0.1),
Click Here for Large Stornesite-(Y) Structure Window Crystal Structure:

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Grew E S , Armbruster T , Medenbach O , Yates M G , Carson C J , American Mineralogist , 91 (2006) p.1412-1424, Stornesite-(Y), (Y, Ca)Vacancy2Na6(Ca,Na)8(Mg,Fe)43(PO4)36, the first, terrestrial Mg-dominant member of the fillowite group, from granulite-facies, paragneiss in the Larsemann Hills, Prydz Bay, East Antarctica, Locality: Larsemann Hills, Prydz Bay, East Antarctica, Note: Isostructural with chladniite

 

Physical Properties of Stornesite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Stornesite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1948,KC= 0.1893
Ncalc = 1.61
Help on Optical Data: Optical Data: Uniaxial (+), w=1.6215, e=1.625, bire=0.0035.
 

Calculated Properties of Stornesite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Stornesite-(Y) =3.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStornesite-(Y) = 9.00 barns/electron
U=PEStornesite-(Y) x relectron= 28.22 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,325.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Stornesite-(Y) per GRapi unit = 754.64 (PPM)

Estimated Radioactivity from Stornesite-(Y) - mild
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.42 cm 28,408 7.68E-07 1,325.13 0.44
100 gm / 3.91 cm 2,841 7.68E-08 132.51 0.04
10 gm / 1.81 cm 284 7.68E-09 13.25 0.00
1 gm / 8.42 mm 28 7.68E-10 1.33 0.00
0.1 gm / 3.91 mm 3 7.68E-11 0.13 0.00
0.01 gm / 1.81 mm 0 7.68E-12 0.01 0.00
0.001 gm / 0.84 mm 0 7.68E-13 0.00 0.00

Weight of pure Stornesite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.20 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.01 % Th) From Sum REE Elements ( 0.20 % REE)
 

Stornesite-(Y) Classification
Help on Dana Class: Dana Class: 38.02.05.06 (38)Anhydrous Phosphates, etc
  (38.02)(A+ B++)5 (XO4)3
  (38.02.05)Fillowite Group
 
38.02.05.01 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3
 
38.02.05.02 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3
 
38.02.05.03 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3
 
38.02.05.04 Galileiite! NaFe4(PO4)3 R 3 3
 
38.02.05.05 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri
 
38.02.05.06 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3
Help on Strunz Class: Strunz Class: 08.AC.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
 
08.AC.50 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3
 
08.AC.50 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3
 
08.AC.50 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3
 
08.AC.50 Galileiite! NaFe4(PO4)3 R 3 3
 
08.AC.50 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3
 
08.AC.50 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri
 

Other Stornesite-(Y) Information
Help on References: References: NAME( AmMin, v91, p1412) PHYS. PROP.(AmMin, v91, p1412) OPTIC PROP.(AmMin, v91, p1412)
Help on See Also: See Also: Links to other databases for Stornesite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Stornesite-(Y) Specimen Label here :

Stornesite-(Y)

(Y, Ca)[ ]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36
Dana No: 38.02.05.06 Strunz No: 08.AC.50
Locality:

 

Notes: