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Elpasolite

Pictures (2 Images total)

Elpasolith
Views (File:
1285258740
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Elpasolith
Bildbreite: 2 mm, Fundort: Le Cetine, Toskana, Italien
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Toskana (Toscana)/Siena, Provinz/Chiusdino/Le Cetine di Cotorniano Mine
Mineral: Elpasolite
Image: 1285258740
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Elpasolith

Bildbreite: 2 mm, Fundort: Le Cetine, Toskana, Italien
Copyright: Luigi Chiappino
Contribution: thdun5 2010-09-23
Locality: Le Cetine di Cotorniano Mine / Chiusdino / Siena, Provinz / Toskana (Toscana) / Italien
Elpasolith x mit Gips xx
Views (File:
1515340668
): 712
Elpasolith x mit Gips xx
Le Cetine Mine,Siena/Toskana,Italien; Bildbreite ca.3 mm
Copyright: Haubi; Contribution: Haubi
Collection: Haubi
Location: Italien/Toskana (Toscana)/Siena, Provinz/Chiusdino/Le Cetine di Cotorniano Mine
Mineral: Elpasolite
Image: 1515340668
License: Usage for Mineralienatlas project only
Elpasolith x mit Gips xx

Le Cetine Mine,Siena/Toskana,Italien; Bildbreite ca.3 mm
Collection: Haubi
Copyright: Haubi
Contribution: Haubi 2018-01-07
Locality: Le Cetine di Cotorniano Mine / Chiusdino / Siena, Provinz / Toskana (Toscana) / Italien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ konz. H2SO4
Crystal System kubisch, Fm3m

Chemism

Chemical formula

K2NaAlF6

Chemical composition

Aluminium, Natrium, Fluor, Kalium

Unit weight: 242.1583479 u; Number of atoms in the formula: 10

Info

Empirical formula:

K2NaAlF6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Fluorine

F

47.07

6

60.00

18.9984033

113.9904195
Sodium

Na

9.49

1

10.00

22.9897702

22.9897702
Aluminium

Al

11.14

1

10.00

26.9815382

26.9815382
Potassium

K

32.29

2

20.00

39.0983100

78.1966200

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.03-040

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

Classification by Hölzel

3.DD.120

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

Dana 8th edition

11.06.02.01

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

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Perovskite supergroup  ⇒ Stoichiometric perovskites  ⇒ Cryolite subgroup

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

RI value α / ω / n

1.376

Ri mean

1.376

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

225

Space Group

Fm3m

Cell parameters a (Å)

8.116

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

534.597

X-Ray Powder Diffraction

4.687(20),
2.868(100),
2.345(70),
2.030(90),
1.658(30),
1.436(30),
1.284(10),
1.085(10)
XRD chart Elpasolite

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)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.995

3.009 ( ρ calc. Mineralienatlas )

Instability

+++ konz. H2SO4

(Co-)Type locality

(Co-)Type locality

USA/Colorado/El Paso County/Cheyenne District/West Cheyenne Canyon/St. Peters Dome

Preface

Author (Name, Year)

Cross & Hillebrand, 1885

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 175

IMA group assignments

Other languages

Spanish

Elpasolita

French

Elpasolite

English

Elpasolite

German

Elpasolith

Russian

Эльпасолит

Alternative Name

Elpasolit

CNMNC symbol

Symbol

Elp

Locations with GPS information

IDs

GUSID (Global unique identifier short form) MKeDuVOvTUirnkgMCu4lKA
GUID (Global unique identifier) B983A730-AF53-484D-AB9E-480C0AEE2528
Database ID 1022