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Simmonsite

Collectors Summary

Color matt crem-lederfarben
Streak color weiß
Hardness (Mohs) 2.75
Cleavages nicht deutlich
Fracture halbmuschelig
Crystal System monoklin, P21/n

Chemism

Chemical formula

Na2Li[AlF6]

Chemical composition

Aluminium, Lithium, Natrium, Fluor

Unit weight: 193.8926981 u; Number of atoms in the formula: 10

Info

Empirical formula:

Na2Li[AlF6]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Lithium

Li

3.58

1

10.00

6.9412000

6.9412000

Fluorine

F

58.79

6

60.00

18.9984033

113.9904195

Sodium

Na

23.71

2

20.00

22.9897702

45.9795404

Aluminium

Al

13.92

1

10.00

26.9815382

26.9815382

Analysis wt%

Ø Na2O : 31.50, Li2O : 7.70, Al2O3 : 26.30, F : 58.60 (Ref: American Mineralogist 99)

Strunz 9th edition incl. updates

3.CB.15

3: Halide (Fluoride, Chloride, Bromide, Iodide)
C: Komplexe Halogenide
B: Insel-Aluminofluoride (Neso-Aluminofluoride)
15:Kryolith-Gruppe

Lapis Classification

III/B.03-025

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
B: Doppelhalogenide
3: mit [BF4] 1-, [SiF6] 2- und [AlF6] 3-

Classification by Hölzel

3.DD.130

3: HALIDES
D: Complex Halides
D: Fluoro-Aluminates
1: Cryolite-Group

Dana 8th edition

11.06.01.02

11: Halide Complexes; Alumino-fluorides
06: Halide Complexes; Alumino-fluorides with miscellaneous formulae
01: Cryolite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Perovskite supergroup  ⇒ Stoichiometric perovskites  ⇒ Cryolite subgroup

Optical Properties

Color

matt crem-lederfarben

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.001

Birefringence chart\! Simmonsite title=Birefringence chart Simmonsite

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

1.359

RI value β

almost

RI value γ / ε

isotr.

Ri mean

1.359

2V angle

b ? 27°~

Optical Data Luminescence

Color SW-UV (254nm)

 

gelblich weiß

SW-UV Intensity

schwach

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

7.501

Cell parameters b (Å)

7.474

Cell parameters c (Å)

7.503

Cell parameters a/b or c/a

1.004

Cell parameters c/b

1.004

Cell parameters α

90°

Cell parameters β

90.85

Cell parameters γ

90°

Z

4

Volume (ų)

420.59

X-Ray Powder Diffraction

4.33(100),
2.65(60),
2.25(70),
2.18(50),
2.158(40),
1.877(90),
1.526(20),
1.324(20)

XRD chart Simmonsite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.75

VHN (Hardness Vickers)

68 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.05

3.062 ( ρ calc. Mineralienatlas )

Cleavages

nicht deutlich

Fracture

halbmuschelig

Tenacity

nicht extrem spröde

Preface

Name from

William Simmons

Author (Name, Year)

Foord & O'Connor & Hughes & Sutley & Falster & Soregaroli & Lichte & K

References

American Mineralogist 84 (1999), 769

IMA group assignments

Other languages

German

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Spanish

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English

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French

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Russian

Симмонсит

CNMNC (IMA)-Number

IMA 1997-045

CNMNC symbol

Symbol

Sim

Locations with GPS information

IDs

GUSID (Global unique identifier short form) g9Kw0nu_GUKxP6toXQzNvg
GUID (Global unique identifier) D2B0D283-BF7B-4219-B13F-AB685D0CCDBE
Database ID 3534