Mosandrite Mineral Data

Mosandrite Mineral Data

General Mosandrite Information

Chemical Formula:

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

Composition:

Molecular Weight = 913.39 gm

Sodium 5.03 % Na 6.79 % Na₂O

Calcium 13.16 % Ca 18.42 % CaO

Cerium 23.01 % Ce 26.95 % Ce₂O₃

Yttrium 4.87 % Y 6.18 % Y₂O₃

Zirconium 1.00 % Zr 1.35 % ZrO₂

Titanium 3.15 % Ti 5.25 % TiO₂

Niobium 3.05 % Nb 4.37 % Nb₂O₅

Silicon 12.30 % Si 26.31 % SiO₂

Oxygen 27.15 % O

Fluorine 7.28 % F 7.28 % F

- % F -3.07 % -O=F₂

______ ______

100.00 % 99.82 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₃Ce_1.5Y_0.5Ti_0.6Nb_0.3Zr_0.1(Si₂O₇)₂O_1.5F_3.5

Environment:

Alteration product of rinkite.

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

Langesundfiord region of southern Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Carl Gustav Mosander (1797-1858), Swedish chemist and mineralogist, who discovered several REE elements.

Synonym:

Johnstrupite

Rinkite

Rinkolite

Mosandrite Image

Images:

Mosandrite

Comments: Yellow to brown resinous crystalline mosandrite with black aegirine.
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mosandrite Crystallography

Axial Ratios:

a:b:c =3.2641:1:1.3173

Cell Dimensions:

a = 18.41, b = 5.64, c = 7.43, Z = 2; beta = 93° V = 770.42 Den(Calc)= 3.94

Crystal System:

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.053(1), 2.687(0.2), 3.561(0.15),

Physical Properties of Mosandrite

Cleavage:

[100] Good

Color:

Yellow, Yellowish green, Reddish brown, Brown.

Density:

3.29

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

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

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

yellow green

Optical Properties of Mosandrite

Gladstone-Dale:

CI meas= -0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.149 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1652,KPDmeas= 0.1979,KC= 0.1942

Optical Data:

Biaxial (+), a=1.646, b=1.649, g=1.658, bire=0.0120, 2V(Calc)=62, 2V(Meas)=43-87. Dispersion r > v strong.

Calculated Properties of Mosandrite

Electron Density:

r_electron=3.09 gm/cc
note: r_Mosandrite=3.29 gm/cc.

Fermion Index

Fermion Index = 0.01123
Boson Index = 0.98877

Photoelectric:

PE_Mosandrite= 127.84 barns/electron
U=PE_Mosandrite x r_electron= 395.55 barns/cc.

Radioactivity:

GRapi = 23,082.68 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Mosandrite** - 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 / 8.34 cm	515,428	1.39E-05	23,082.68	7.59
100 gm / 3.87 cm	51,543	1.39E-06	2,308.27	0.76
10 gm / 1.80 cm	5,154	1.39E-07	230.83	0.08
1 gm / 8.34 mm	515	1.39E-08	23.08	0.01
0.1 gm / 3.87 mm	52	1.39E-09	2.31	0.00
0.01 gm / 1.80 mm	5	1.39E-10	0.23	0.00
0.001 gm / 0.83 mm	1	1.39E-11	0.02	0.00

Weight of pure Mosandrite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.29 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 ( 1.15 % Th) From Sum REE Elements (23.01 % REE)

Mosandrite Classification

Dana Class:

56.2.5.1 (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.12-10 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 Mosandrite Information

References:

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

See Also:

Links to other databases for Mosandrite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Mosandrite

Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3
Dana No: 56.2.5.1 Strunz No: VIII/C.12-10
Locality:

Notes: