Grenmarite Mineral Data

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: The name is after Grenmar, the Norse name of the Langesundsfjord. 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 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 Diaphaneity: 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= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2001,KPDmeas= 0.2047,KC= 0.215
Ncalc = 1.75 - 1.77 Optical Data: Biaxial (?), a=1.694, g=1.735, bire=0.0410  

Calculated Properties of Grenmarite

Electron Density: Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Grenmarite =3.49 gm/cc.
Fermion Index: Fermion Index = 0.03
Boson Index = 0.97 Photoelectric: PE_Grenmarite = 36.58 barns/electron
U=PE_Grenmarite x rElectron Density= 121.57 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grenmarite is Not Radioactive  

Grenmarite Classification

Dana Class: 56.02.06a.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O   (56.02)with cations in [4] and/or >[4] coordination   (56.02.06a)Seidozerite - Lamprophyllite group  

56.02.06a.01 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

 

56.02.06a.02 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

 

56.02.06a.03 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

Strunz Class: 09.BE.25 09 - SILICATES (Germanates)   09.B - Sorosilicates   09.BE -Si2O7 groups with additional anions;  

09.BE.25 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

 

09.BE.25 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

 

09.BE.25 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

 

09.BE.25 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

 

09.BE.25 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

 

09.BE.25 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

 

09.BE.25 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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