General Rinkite Information
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Chemical Formula: |
Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 |
Composition: |
Molecular Weight = 820.37 gm |
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Sodium 7.01 % Na 9.44 % Na2O |
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Calcium 19.54 % Ca 27.34 % CaO |
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Cerium 17.08 % Ce 20.00 % Ce2O3 |
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Titanium 4.38 % Ti 7.30 % TiO2 |
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Niobium 2.83 % Nb 4.05 % Nb2O5 |
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Silicon 13.69 % Si 29.30 % SiO2 |
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Oxygen 33.15 % O |
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Fluorine 2.32 % F 2.32 % F |
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- % F -0.98 % -O=F2 |
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______ ______ |
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100.00 % 98.78 % = TOTAL OXIDE |
Empirical Formula: |
Na2.5Ca4CeTi0.75Nb0.25(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
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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
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Physical Properties of Rinkite
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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 |
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Optical Properties of Rinkite
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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. |
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Calculated Properties of Rinkite
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Electron Density: |
relectron=3.36 gm/cc note: rRinkite =3.50 gm/cc. |
Fermion Index |
Fermion Index = 0.01247 Boson Index = 0.98753 |
Photoelectric: |
PERinkite = 90.31 barns/electron U=PERinkite x relectron= 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)
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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)
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Rinkite Classification
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Dana Class: |
56.2.5.5 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O |
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(56.2)with cations in [4] and/or >[4] coordination |
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(56.2.5)Mosandrite and related species |
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56.2.5.1 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2 |
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56.2.5.2 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m |
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56.2.5.3 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m |
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56.2.5.4 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1 |
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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 |
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VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] |
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VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series |
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VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2 |
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VIII/C.12-20 Rinkite Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2 |
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VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m |
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VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1 |
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VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1 |
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VIII/C.12-55 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1 |
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VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1 |
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Other Rinkite Information
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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 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (MinSocAm)
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Print or Cut-and-Paste your Rinkite Specimen Label here :
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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:
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