Rinkite Mineral Data

General Rinkite Information

Chemical Formula:

Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2

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

Empirical Formula:

Na_2.5Ca₄CeTi_0.75Nb_0.25(Si₂O₇)₂O₃F

Environment:

Mineral in sodalite-syenite rocks.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Julianehaab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named after H. RINK, director of a Danesh-Greenlandic trade group.

Name Pronunciation:

Rinkite

Synonym:

Rinkolite

Rinkite Image

Images:

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

Axial Ratios:

a:b:c =0.7661:1:2.5411

Cell Dimensions:

a = 5.679, b = 7.412, c = 18.835, Z = 2; beta = 102.26° V = 774.74 Den(Calc)= 3.52

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2₁

Physical Properties of Rinkite

Cleavage:

{100} Good

Color:

Yellow, Yellowish green, Brown.

Density:

3.5

Diaphaneity:

Transparent to translucent

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Rinkite

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

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

Electron Density:

Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Rinkite =3.50 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Rinkite= 90.31 barns/electron
U=PE_Rinkite x r_electron= 303.05 barns/cc.

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

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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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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:

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