Grenmarite Mineral Data

Grenmarite Mineral Data

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General Grenmarite Information

Chemical Formula:

(Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4

Composition:

Molecular Weight = 780.16 gm

Sodium 11.82 % Na 15.93 % Na₂O

Calcium 1.34 % Ca 1.87 % CaO

Yttrium 0.23 % Y 0.29 % Y₂O₃

Zirconium 24.20 % Zr 32.69 % ZrO₂

Titanium 2.76 % Ti 4.61 % TiO₂

Manganese 6.62 % Mn 4.36 % MnO / 4.65 % Mn₂O₃

Iron 1.65 % Fe 2.12 % FeO

Silicon 14.40 % Si 30.81 % SiO₂

Oxygen 31.58 % O

Fluorine 5.41 % F 5.41 % F

- % F -2.28 % -O=F₂

______ ______

100.00 % 100.46 % = TOTAL OXIDE

Empirical Formula:

Zr_1.52Mn³⁺_0.46Y_0.02Zr_0.55Ti_0.45Mn²⁺_0.48Na_0.29Fe²⁺_0.23Na_3.72Ca_0.26Si₄O_15.4F_2.22

Environment:

Syenite pegmatite. Isostructural with seidozerite.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Eastern side of the island Vesle Arøya in the Langesundsfjord district, Norway. Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

Synonym:

IMA2003-024

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Grenmarite Crystallography

Axial Ratios:

a:b:c =0.7856:1:2.602

Cell Dimensions:

a = 5.6082, b = 7.1387, c = 18.575, Z = 2; beta = 102.6° V = 725.75 Den(Calc)= 3.57

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): 2.898(1), 3.027(0.68), 2.613(0.26),1.853(0.24), 2.459(0.24), 3.949(0.15), 1.65(0.14), 1.786(0.14),

Crystal Structure:

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Bellezza M , Franzini M , Larsen A O , Merlino S , Perchiazzi N , European Journal of Mineralogy , 16 (2004) p.971-978, Grenmarite, a new member of the gotzenite-seidozerite-rosenbuschite, group from the Langesundsfjord district, Norway: definition and crystal structure, Locality: Langesundsfjord district, Norway

Physical Properties of Grenmarite

Cleavage:

[001] Good

Color:

Yellowish brown, Dark brown.

Density:

3.49

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Grenmarite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2001,KPDmeas= 0.2047,KC= 0.2064

Optical Data:

Biaxial (?), a=1.694, g=1.735, bire=0.0410

Calculated Properties of Grenmarite

Electron Density:

r_electron=3.32 gm/cc
note: r_Grenmarite=3.49 gm/cc.

Fermion Index

Fermion Index = 0.03797
Boson Index = 0.96203

Photoelectric:

PE_Grenmarite= 36.58 barns/electron
U=PE_Grenmarite x r_electron= 121.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grenmarite is Not Radioactive

Grenmarite Classification

Dana Class:

56.2.6a.3 (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.13-05 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 Grenmarite Information

References:

NAME( EurJMin 16:971) PHYS. PROP.(EurJMin 16:971) OPTIC PROP.(EurJMin 16:971)

See Also:

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

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

Grenmarite

(Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4
Dana No: 56.2.6a.3 Strunz No: VIII/C.13-05
Locality:

Notes: