Seidozerite Mineral Data

Seidozerite Mineral Data +

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General Seidozerite Information

Chemical Formula:

(Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2

Composition:

Molecular Weight = 368.38 gm

Sodium 11.23 % Na 15.14 % Na₂O

Calcium 2.18 % Ca 3.04 % CaO

Magnesium 1.32 % Mg 2.19 % MgO

Zirconium 17.33 % Zr 23.42 % ZrO₂

Titanium 7.80 % Ti 13.01 % TiO₂

Manganese 2.98 % Mn 3.85 % MnO

Aluminum 0.73 % Al 1.38 % Al₂O₃

Iron 1.52 % Fe 2.17 % Fe₂O₃

Silicon 15.25 % Si 32.62 % SiO₂

Oxygen 36.05 % O

Fluorine 3.61 % F 3.61 % F

- % F -1.52 % -O=F₂

______ ______

100.00 % 98.91 % = TOTAL OXIDE

Empirical Formula:

Na_1.8Ca_0.2Zr_0.7Ti_0.6Mn²⁺_0.2Mg_0.2Fe³⁺_0.1Al_0.1(Si₂O₇)O_1.3F_0.7

Environment:

Thin veins in nepheline syenite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Lovozero massif, near the Muruai and Uel'kuai Rivers, Seidozero region, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 22334

PDF 14-447

Seidozerite Image

Images:

Seidozerite Arfvedsonite

Comments: Dark red translucent seidozerite with vitreous, black arfvedsonite.
Location: Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Seidozerite Crystallography

Axial Ratios:

a:b:c =0.7788:1:2.5774

Cell Dimensions:

a = 5.53, b = 7.1, c = 18.3, Z = 4; beta = 102.7° V = 700.93 Den(Calc)= 3.49

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c

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

By Intensity(I/I_o): 2.97(1), 1.83(0.7), 2.87(0.7),

Crystal Structure:

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Christiansen C C , Johnsen O , Makovicky E , The Canadian Mineralogist , 41 (2003) p.1203-1224, Crystal chemistry of the rosenbuschite group, Sample: 1993.158

Physical Properties of Seidozerite

Cleavage:

[001] Perfect

Color:

Brownish red, Reddish yellow.

Density:

3.472

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Seidozerite

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2209,KPDmeas= 0.2221,KC= 0.2269

Optical Data:

Biaxial (+), a=1.725, b=1.758, g=1.83, bire=0.1050, 2V(Calc)=72, 2V(Meas)=68.

Pleochroism (x):

dark red.

Pleochroism (y):

red.

Pleochroism (z):

light yellow.

Calculated Properties of Seidozerite

Electron Density:

r_electron=3.34 gm/cc
note: r_Seidozerite=3.47 gm/cc.

Fermion Index

Fermion Index = 0.03849
Boson Index = 0.96151

Photoelectric:

PE_Seidozerite= 26.83 barns/electron
U=PE_Seidozerite x r_electron= 89.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Seidozerite is Not Radioactive

Seidozerite Classification

Dana Class:

56.2.6a.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

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

(56.2.6a)Seidozerite - Lamprophyllite group

56.2.6a.1 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

56.2.6a.2 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

56.2.6a.3 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

Strunz Class:

VIII/C.13-10 VIII - Silicates

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

VIII/C.13 - Rosenbuschite - Lamprophyllite - Hejtmanite series

VIII/C.13-05 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

VIII/C.13-10 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

VIII/C.13-15 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

VIII/C.13-20 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

VIII/C.13-25 Kukisvumite Na6ZnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

VIII/C.13-27 Shkatulkalite! Na10MnTi3Nb3(Si2O7)6(OH)2F·12(H2O) P 2,Pm,P 2/m Mono

VIII/C.13-30 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

VIII/C.13-40 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

VIII/C.13-50 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

Other Seidozerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Seidozerite

(Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2
Dana No: 56.2.6a.1 Strunz No: VIII/C.13-10
Locality:

Notes: