Mosandrite Mineral Data

Mosandrite Mineral Data

[Welcome] [Newest Minerals] [Gallery] [About Us] [How to Buy]
We are www.minernet.it, an Italian company which deals rare, unusual,
and showy mineral specimens. We specialise in minerals from Tsumeb,
Mont Saint Hilaire, Bolivia and Major Italian sites.

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

Search for Mosandrite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Mosandrite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Mosandrite Mineral Data :

Ask about Mosandrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

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: