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Rinkite Mineral Data

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General Rinkite Information

Help on Chemical  Formula: Chemical Formula: Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2
Help on Composition: Composition: Molecular Weight = 820.37 gm
   Sodium     7.01 %  Na    9.44 % Na2O
   Calcium   19.54 %  Ca   27.34 % CaO
   Cerium    17.08 %  Ce   20.00 % Ce2O3
   Titanium   4.38 %  Ti    7.30 % TiO2
   Niobium    2.83 %  Nb    4.05 % Nb2O5
   Silicon   13.69 %  Si   29.30 % SiO2
   Oxygen    33.15 %  O
   Fluorine   2.32 %  F     2.32 % F
               -   %   F    -0.98 % -O=F2    
            ______        ______ 
            100.00 %       98.78 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2.5Ca4CeTi0.75Nb0.25(Si2O7)2O3F
Help on Environment: Environment: Mineral in sodalite-syenite rocks.
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Julianehaab district, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after H. RINK, director of a Danesh-Greenlandic trade group.
Help on Name Pronunciation: Name Pronunciation: Rinkite Say RINKITE
Help on Synonym: Synonym: Rinkolite
 

Rinkite Image

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  Rinkite

Comments: Hexagonal prismatic crystals of rinkite in nepheline-syenite pegmatite matrix. Associated with orthoclase, black aegirine and minor eudialyte.
Location: Takhtarvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Specimen Size 7x3.5x2.5 cm..
© Pavel M. Kartashov

Rinkite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7661:1:2.5411
Help on Cell Dimensions: Cell Dimensions: a = 5.679, b = 7.412, c = 18.835, Z = 2; beta = 102.26° V = 774.74 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
 

Physical Properties of Rinkite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Yellow, Yellowish green, Brown.
Help on Density: Density: 3.5
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow white
 

Optical Properties of Rinkite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.068 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1907,KPDmeas= 0.1918,KC= 0.2057
Ncalc = 1.72
Help on Optical Data: Optical Data: Biaxial (+), a=1.665, b=1.668, g=1.681, bire=0.0160, 2V(Calc)=52, 2V(Meas)=43. Dispersion strong, r < v.
 

Calculated Properties of Rinkite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Rinkite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERinkite = 90.31 barns/electron
U=PERinkite x relectron= 303.05 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 17,466.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Rinkite per GRapi unit = 57.25 (PPM)

Rinkite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Rinkite - 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 / 8.17 cm 382,581 1.03E-05 17,466.02 5.74
100 gm / 3.79 cm 38,258 1.03E-06 1,746.60 0.57
10 gm / 1.76 cm 3,826 1.03E-07 174.66 0.06
1 gm / 8.17 mm 383 1.03E-08 17.47 0.01
0.1 gm / 3.79 mm 38 1.03E-09 1.75 0.00
0.01 gm / 1.76 mm 4 1.03E-10 0.17 0.00
0.001 gm / 0.82 mm 0 1.03E-11 0.02 0.00

Weight of pure Rinkite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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 ( 0.85 % Th) From Sum REE Elements (17.08 % REE)
 

Rinkite Classification

Help on  Dana Class: Dana Class: 56.02.05.05 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.05)Mosandrite and related species
 
56.02.05.01 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
56.02.05.02 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
56.02.05.03 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 
56.02.05.04 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
56.02.05.05 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
56.02.05.06 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 
56.02.05.07 Dovyrenite! Ca6Zr[Si2O7]2(OH)4 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.20 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
09.BE.20 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
09.BE.20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
09.BE.20 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 

Other Rinkite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Rinkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Rinkite Specimen Label here :

Rinkite

Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2
Dana No: 56.02.05.05 Strunz No: 09.BE.20
Locality:

 

Notes:

 

 
   
 


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