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Vyuntspakhkite-(Y) Mineral Data

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General Vyuntspakhkite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Yb,Er)4Al2AlSi5O18(OH)5
Help on Composition: Composition: Molecular Weight = 1,118.90 gm
   La,Ce,Pr,Nd,Sm,  12.61 %  RE   14.71 % REE2O3
   Yttrium          14.14 %  Y    17.96 % Y2O3
   Ytterbium        20.26 %  Yb   23.07 % Yb2O3
   Aluminum          7.31 %  Al   13.81 % Al2O3
   Silicon          12.40 %  Si   26.53 % SiO2
   Hydrogen          0.45 %  H     3.99 % H2O
   Oxygen           32.83 %  O
                   ______        ______ 
                   100.00 %      100.07 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y1.78Yb1.31REE0.98Al3.03Si4.94O18(OH)4.96
Help on Environment: Environment: Two generations of crystals occur in fluorite in "amazonite" pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Mt. Vyuntspakhk, 5 km southeast of Mt. Ploskaya, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality and its yttrium content.
Help on Name Pronunciation: Name Pronunciation: Vyuntspakhkite-(Y) + Pronunciation Say VYUNTSPAKHKITE-(Y)
Help on Synonym: Synonym: ICSD 20861
  PDF 35-708
 

Vyuntspakhkite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3949:1:0.421
Help on Cell Dimensions: Cell Dimensions: a = 5.83, b = 14.763, c = 6.216, Z = 1; beta = 123.05° V = 448.43 Den(Calc)= 4.14
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.47(1), 2.604(0.8), 7.4(0.6),
 

Physical Properties of Vyuntspakhkite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Orange.
Help on Density: Density: 4.02
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Cathodoluminescence, Short UV=faint yellow green.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Vyuntspakhkite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1684,KPDmeas= 0.1735,KC= 0.1703
Ncalc = 1.68 - 1.71
Help on Optical Data: Optical Data: Biaxial (+), a=1.68, b=1.692, g=1.72, bire=0.0400, 2V(Calc)=68, 2V(Meas)=68.
 

Calculated Properties of Vyuntspakhkite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.83 gm/cc
note: Specific Gravity of Vyuntspakhkite-(Y) =4.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEVyuntspakhkite-(Y) = 290.04 barns/electron
U=PEVyuntspakhkite-(Y) x relectron=1,112.00 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 32,515.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Vyuntspakhkite-(Y) per GRapi unit = 30.75 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 935.44 ±233.86 grams of pure Vyuntspakhkite-(Y) .

Estimated Radioactivity from Vyuntspakhkite-(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 / 7.73 cm 737,344 1.99E-05 32,515.92 10.69
100 gm / 3.59 cm 73,734 1.99E-06 3,251.59 1.07
10 gm / 1.66 cm 7,373 1.99E-07 325.16 0.11
1 gm / 7.73 mm 737 1.99E-08 32.52 0.01
0.1 gm / 3.59 mm 74 1.99E-09 3.25 0.00
0.01 gm / 1.66 mm 7 1.99E-10 0.33 0.00
0.001 gm / 0.77 mm 1 1.99E-11 0.03 0.00

Weight of pure Vyuntspakhkite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.14 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 ( 1.64 % Th) From Sum REE Elements (32.87 % REE)
 

Vyuntspakhkite-(Y) Classification

Help on  Dana Class: Dana Class: 78.07.18.01 (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.18)Dana Group
 
78.07.18.01 Vyuntspakhkite-(Y) (Y,Yb,Er)4Al2AlSi5O18(OH)5 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.BG.40 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.40 Vyuntspakhkite-(Y) (Y,Yb,Er)4Al2AlSi5O18(OH)5 P 21/c 2/m
 

Other Vyuntspakhkite-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Vyuntspakhkite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Vyuntspakhkite-(Y)

(Y,Yb,Er)4Al2AlSi5O18(OH)5
Dana No: 78.07.18.01 Strunz No: 09.BG.40
Locality:

 

Notes:

 

 
   
 


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