Rinkite Mineral Data

Rinkite Mineral Data +

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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.

Synonym:

Rinkolite

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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 - SphenoidalH-M Symbol (2) Space Group: P 2₁

Crystal Structure:

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Galli E , Alberti A , Acta Crystallographica, Section B , 27 (1971) p.1277-1284, The crystal structure of rinkite

Physical Properties of Rinkite

Cleavage:

[100] Good

Color:

Yellow, Yellowish green, Brown.

Density:

3.5

Diaphaniety:

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

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:

r_electron=3.36 gm/cc
note: r_Rinkite=3.50 gm/cc.

Fermion Index

Fermion Index = 0.01247
Boson Index = 0.98753

Photoelectric:

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

Radioactivity:

GRapi = 17,466.01 (Gamma Ray American Petroleum Institute Units)

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	17,466.01	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:

56.2.5.5 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.5)Mosandrite and related species

56.2.5.1 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 2₁ 2

56.2.5.2 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 2₁/a 2/m

56.2.5.3 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m

56.2.5.4 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1

56.2.5.5 Rinkite ! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 2₁ 2

Strunz Class:

VIII/C.12-20 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series

VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 2₁ 2

VIII/C.12-20 Rinkite Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 2₁ 2

VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 2₁/a 2/m

VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1

VIII/C.12-55 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

Other Rinkite Information

References:

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

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Rinkite

Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2
Dana No: 56.2.5.5 Strunz No: VIII/C.12-20
Locality:

Notes: