Vyuntspakhkite-(Y) Mineral Data

[About Us] [Products] [Fluorescent Mineals] [Contact Us]
UVTools is a supplier of affordable ultraviolet lamps and fluorescent minerals
Our customers include mineral dealers, gift shops, and museums worldwide
We provide an array of shortwave, midwave, and longwave lamps at the best price!

General Vyuntspakhkite-(Y) Information

Chemical Formula:

(Y,Yb,Er)4Al2AlSi5O18(OH)5

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

Empirical Formula:

Y_1.78Yb_1.31REE_0.98Al_3.03Si_4.94O₁₈(OH)_4.96

Environment:

Two generations of crystals occur in fluorite in "amazonite" pegmatites.

IMA Status:

Approved IMA 1987

Locality:

Mt. Vyuntspakhk, 5 km southeast of Mt. Ploskaya, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality and its yttrium content.

Name Pronunciation:

Vyuntspakhkite-(Y) + Pronunciation

Synonym:

ICSD 20861

PDF 35-708

Search for Vyuntspakhkite-(Y) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Vyuntspakhkite-(Y) Crystallography

Axial Ratios:

a:b:c =0.3949:1:0.421

Cell Dimensions:

a = 5.83, b = 14.763, c = 6.216, Z = 1; beta = 123.05° V = 448.43 Den(Calc)= 4.14

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.47(1), 2.604(0.8), 7.4(0.6),

Physical Properties of Vyuntspakhkite-(Y)

Cleavage:

None

Color:

Colorless, Orange.

Density:

4.02

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

Cathodoluminescence, Short UV=faint yellow green.

Luster:

Adamantine

Streak:

white

Optical Properties of Vyuntspakhkite-(Y)

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

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)

Electron Density:

Bulk Density (Electron Density)=3.83 gm/cc
note: Specific Gravity of Vyuntspakhkite-(Y) =4.14 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Vyuntspakhkite-(Y)}= 290.04 barns/electron
U=PE_{Vyuntspakhkite-(Y)} x r_electron=1,112.00 barns/cc.

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

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Vyuntspakhkite-(Y) using:

[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Vyuntspakhkite-(Y) :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Vyuntspakhkite-(Y) Mineral Data :

Ask about Vyuntspakhkite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: