Mineralogy Database

Grenmarite Mineral Data

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General Grenmarite Information

Help on Chemical  Formula: Chemical Formula: (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Zr1.52Mn3+0.46Y0.02Zr0.55Ti0.45Mn2+0.48Na0.29Fe2+0.23Na3.72Ca0.26Si4O15.4F2.22
Help on Environment: Environment: Syenite pegmatite. Isostructural with seidozerite.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Eastern side of the island Vesle Ar´┐Żya in the Langesundsfjord district, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name is after Grenmar, the Norse name of the Langesundsfjord.
Help on Synonym: Synonym: IMA2003-024

Grenmarite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7856:1:2.602
Help on Cell Dimensions: Cell Dimensions: a = 5.6082, b = 7.1387, c = 18.575, Z = 2; beta = 102.6° V = 725.75 Den(Calc)= 3.57
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),

Physical Properties of Grenmarite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Yellowish brown, Dark brown.
Help on Density: Density: 3.49
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Grenmarite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.694, g=1.735, bire=0.0410

Calculated Properties of Grenmarite

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

Grenmarite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( EurJMin 16:971) PHYS. PROP.(EurJMin 16:971) OPTIC PROP.(EurJMin 16:971)
Help on See Also: 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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Dana No: 56.02.06a.03 Strunz No: 09.BE.25





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