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Hundholmenite-(Y) Mineral Data

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General Hundholmenite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,REE,Ca,Na)15(Al,Fe+++)CaxAs+++1-x(Si,As+++++)Si6B3(O,F)48
Help on Composition: Composition: Molecular Weight = 2,521.06 gm
   Sodium            0.91 %  Na    1.23 % Na2O
   Calcium           5.56 %  Ca    7.79 % CaO
   La,Ce,Pr,Nd,Sm,  28.56 %  RE   33.32 % REE2O3
   Yttrium          21.16 %  Y    26.87 % Y2O3
   Aluminum          0.80 %  Al    1.52 % Al2O3
   Iron              0.55 %  Fe    0.79 % Fe2O3
   Silicon           7.52 %  Si   16.09 % SiO2
   Boron             1.29 %  B     4.14 % B2O3
   Arsenic           2.23 %   As    1.96 % As2O3 /  1.14 % As2O5
   Oxygen           25.39 %  O
   Fluorine          6.03 %  F     6.03 % F
                      -   %   F    -2.54 % -O=F2    
                   ______        ______ 
                   100.00 %       98.33 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y6REE5Ca3NaAl0.75Fe3+0.25Ca0.5As0.5Si0.75As0.25Si6B3O40F8
Help on Environment: Environment: Found embedded in REE-bearing fluorite, in a granitic pegmatite. Vicanite group.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Hundholmen, Tysfjord, Nordland, north Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2006-005
 

Hundholmenite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.53114
Help on Cell Dimensions: Cell Dimensions: a = 10.675, c = 27.02, Z = 3; V = 2,666.56 Den(Calc)= 4.71
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.972(1), 2.947(0.76), 2.924(0.66),3.114(0.43), 1.978(0.37), 2.681(0.36), 4.38(0.33), 3.095(0.29),
 

Physical Properties of Hundholmenite-(Y)

Help on Color: Color: Pale brown.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Hundholmenite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1599,KC= 0.1651
Ncalc = 1.78
Help on Optical Data: Optical Data: Uniaxial (-).
 

Calculated Properties of Hundholmenite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.34 gm/cc
note: Specific Gravity of Hundholmenite-(Y) =4.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEHundholmenite-(Y) = 205.22 barns/electron
U=PEHundholmenite-(Y) x relectron= 891.43 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 28,195.18 (Gamma Ray American Petroleum Institute Units)
Concentration of Hundholmenite-(Y) per GRapi unit = 35.47 (PPM)

Hundholmenite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Hundholmenite-(Y) - weak
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 / 7.40 cm 642,028 1.74E-05 28,195.18 9.27
100 gm / 3.44 cm 64,203 1.74E-06 2,819.52 0.93
10 gm / 1.59 cm 6,420 1.74E-07 281.95 0.09
1 gm / 7.40 mm 642 1.74E-08 28.20 0.01
0.1 gm / 3.44 mm 64 1.74E-09 2.82 0.00
0.01 gm / 1.59 mm 6 1.74E-10 0.28 0.00
0.001 gm / 0.74 mm 1 1.74E-11 0.03 0.00

Weight of pure Hundholmenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.71 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 ( 1.43 % Th) From Sum REE Elements (28.56 % REE)
 

Hundholmenite-(Y) Classification

Help on  Dana Class: Dana Class: 54.03.01.02 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.03)Dana Type
  (54.03.01)Vicanite Group
 
54.03.01.01 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m
 
54.03.01.02 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m
 
54.03.01.03 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m
Help on  Strunz Class: Strunz Class: 09.AJ.35 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
 
09.AJ.35 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m
 
09.AJ.35 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m
 
09.AJ.35 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m
 
09.AJ.35 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m
 

Other Hundholmenite-(Y) Information

Help on References: References: NAME( MinMag v71:179) PHYS. PROP.(MinMag v71:179) OPTIC PROP.(MinMag v71:179)
Help on See Also: See Also: Links to other databases for Hundholmenite-(Y) :
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 Hundholmenite-(Y) Specimen Label here :

Hundholmenite-(Y)

(Y,REE,Ca,Na)15(Al,Fe+++)CaxAs+++1-x(Si,As+++++)Si6B3(O,F)48
Dana No: 54.03.01.02 Strunz No: 09.AJ.35
Locality:

 

Notes:

 

 
   
 


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