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Grenmarite

Additional Functions

Collectors Summary

Color gelbbraun bis dunkelbraun
Streak color blass gelblich braun
Lustre Glasglanz
Hardness (Mohs) 4.5
Cleavages gut (001)
Fracture uneben
Crystal System monoklin, P2/c

Chemism

Chemical formula

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

Additional chem. information

Seidozerit Gruppe

Chemical composition

Calcium, Mangan, Natrium, Silicium, Titan, Zirconium, Fluor, Sauerstoff

Unit weight: 804.019773775 u; Number of atoms in the formula: 30

Info

Empirical formula:

(Zr0.75Mn0.25)2(Zr0.75Ti0.25)(Mn0.75Na0.25)(Na0.75Ca0.25)4(Si2O7)2(O0.75F0.25)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

33.83

17

56.67

15.9994300

271.9903100
Fluorine

F

2.36

1

3.33

18.9984033

18.9984033
Sodium

Na

9.29

3.25

10.83

22.9897702

74.7167532
Silicon

Si

13.97

4

13.33

28.0855300

112.3421200
Calcium

Ca

4.98

1

3.33

40.0784000

40.0784000
Titanium

Ti

1.49

0.25

0.83

47.8671000

11.9667750
Manganese

Mn

8.54

1.25

4.17

54.9380499

68.6725624
Zirconium

Zr

25.53

2.25

7.50

91.2242000

205.2544500

Analysis wt%

SiO2 : 29.85, TiO2 : 4.51, ZrO2 : 31.63, FeO : 2.01, MnO : 8.25, CaO : 1.84, Na2O : 15.43, F : 5.24 (Ref: European Journal of Mineralogy 2004)

Strunz 9th edition incl. updates

9.BE.25

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
25:Lamprophyllit-Gruppe

Lapis Classification

VIII/C.13-005

VIII: SILIKATE
C: Gruppensilikate
13: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F); Lamprophyllit-Reihe

Classification by Hölzel

9.BG.120

9: SILICATES
B: Sorosilicates
G: Mosandrite-Group

Dana 8th edition

56.02.06a.03

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
02: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with cations in [4] and/or >[4] coordination
06a: Seidozerite - Lamprophyllite group

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Rosenbuschite group

Optical Properties

Color

gelbbraun bis dunkelbraun

Streak color

blass gelblich braun

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz

max. Birefringence

0.041
Birefringence chart\! Grenmarite title=Birefringence chart Grenmarite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.694

RI value γ / ε

1.735

Ri mean

1.715

2V angle

Biaxial (+) nd

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

13

Space Group

P2/c

Cell parameters a (Å)

5.608

Cell parameters b (Å)

7.139

Cell parameters c (Å)

18.575

Cell parameters a/b or c/a

0.786

Cell parameters c/b

2.602

Cell parameters α

90°

Cell parameters β

102.60

Cell parameters γ

90°

Z

2

Volume (ų)

725.75

X-Ray Powder Diffraction

3.949(15), 3.027(68), 2.898(100), 2.613(26), 2.459(24), 1.853(24), 1.786(14), 1.650(14)
XRD chart Grenmarite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.49 (3.568 berechnet)

3.679 ( ρ calc. Mineralienatlas )

Cleavages

gut (001)

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Norwegen/Vestfold, Provinz/Larvik, Kommune/Langesundsfjord/Vesle Arøy, Insel

Preface

Author (Name, Year)

Bellezza & Franzini & Larsen & Merlino & Perchiazzi, 2004

References

Typmaterial: Universität von Pisa, Italien und Universität von Oslo, Norwegen

Bellezza, M., Franzini, F., Larsen, A.O., Merlino, S., Perchiazzi, N. (2004): Grenmarit, ein neues Mitglied der Götzenit-Seidozerit-Rosenbuschit Gruppe aus dem Langesundsfjord Distrikt: Definition und Kristallstruktur. European Journal of Mineralogy, 16, 971-978.

Bellezza, M. (2005): Kristall-Chemische-Studie von Zr,Ti,Nb,REE-Disilicateen mit genereller Formel M16(Si2O7)4(O,OH,F)8, angehörig der Cuspidin, Götzenit-Rosenbuschit-Seidozerit und Rinkit Familie. Plinius, 31, 51-54.

IMA group assignments

Other languages

German

Grenmarit

English

Grenmarite

Russian

Гренмарит

Traditional Chinese

矽錳鋯鈉石

Simplified Chinese

硅锰锆钠石

CNMNC (IMA)-Number

IMA 2003-024

CNMNC symbol

Symbol

Grn

IDs

GUSID (Global unique identifier short form) vmpxjpI9c0Olen3iW3ofZQ
GUID (Global unique identifier) 8E716ABE-3D92-4373-A57A-7DE25B7A1F65
Database ID 1454