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

$Help on X Ray Diffraction:$ 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

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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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: 56.02.06a.03 Strunz No: 09.BE.25
Locality:

Notes: