Mineralogy Database

Keiviite-(Y) Mineral Data

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General Keiviite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Yb)2Si2O7
Help on Composition: Composition: Molecular Weight = 388.05 gm
   Yttrium    34.37 %  Y    43.64 % Y2O3
   Ytterbium  22.30 %  Yb   25.39 % Yb2O3
   Silicon    14.48 %  Si   30.97 % SiO2
   Oxygen     28.86 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y1.5Yb0.5Si2O7
Help on Environment: Environment: In fissures in quartz and fluorite in \amazonite" pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Mt. Ploskaya, Keivy massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the relation to keiviite-(Yb) and the yttrium content.
Help on Name Pronunciation: Name Pronunciation: Keiviite-(Y) Say KEIVIITE-(Y)
 

Keiviite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7639:1:0.5283
Help on Cell Dimensions: Cell Dimensions: a = 6.845, b = 8.96, c = 4.734, Z = 2; beta = 101.65° V = 284.36 Den(Calc)= 4.53
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 4.65(0.9), 3.04(0.8),
 

Physical Properties of Keiviite-(Y)

Help on Cleavage: Cleavage: {110} Perfect, {001} Indistinct
Help on Color: Color: Colorless, White, Pink brown.
Help on Density: Density: 4.45
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Keiviite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1633,KPDmeas= 0.1662,KC= 0.1642
Ncalc = 1.73 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.713, b=1.748, g=1.758, bire=0.0450, 2V(Calc)=54, 2V(Meas)=55-56.
 

Calculated Properties of Keiviite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Keiviite-(Y) =4.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEKeiviite-(Y) = 261.05 barns/electron
U=PEKeiviite-(Y) x relectron=1,081.85 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 21,757.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Keiviite-(Y) per GRapi unit = 45.96 (PPM)

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

Estimated Radioactivity from Keiviite-(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 / 7.50 cm 499,438 1.35E-05 21,757.45 7.15
100 gm / 3.48 cm 49,944 1.35E-06 2,175.74 0.72
10 gm / 1.62 cm 4,994 1.35E-07 217.57 0.07
1 gm / 7.50 mm 499 1.35E-08 21.76 0.01
0.1 gm / 3.48 mm 50 1.35E-09 2.18 0.00
0.01 gm / 1.62 mm 5 1.35E-10 0.22 0.00
0.001 gm / 0.75 mm 0 1.35E-11 0.02 0.00

Weight of pure Keiviite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.53 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 ( 1.11 % Th) From Sum REE Elements (22.30 % REE)
 

Keiviite-(Y) Classification

Help on  Dana Class: Dana Class: 55.02.01a.02 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02)with cations in [6] coordination
  (55.02.01a)Thortveitite group
 
55.02.01a.01 Gittinsite CaZrSi2O7 C 2/m 2/m
 
55.02.01a.02 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m
 
55.02.01a.03 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m
 
55.02.01a.04 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BC.05 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BC -Si2O7 groups, without non-tetrahedral anions;
 
09.BC.05 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m
 
09.BC.05 Gittinsite CaZrSi2O7 C 2/m 2/m
 
09.BC.05 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m
 
09.BC.05 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m
 
09.BC.05 Yttrialite-(Y) (Y,Th)2Si2O7 P 21/m 2/m
 

Other Keiviite-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.73,p191,1988) OPTIC PROP.(Am.Min.,Vol.73,p191,1988)
Help on See Also: See Also: Links to other databases for Keiviite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Keiviite-(Y)

(Y,Yb)2Si2O7
Dana No: 55.02.01a.02 Strunz No: 09.BC.05
Locality:

 

Notes:

 

 
   
 


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