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Davidsmithite

Collectors Summary

Crystal System hexagonal, P63

Additional information / Summary

Verwandt mit Trinephelin und Nephelin

Chemism

Chemical formula

(Ca,☐)2Na6Al8Si8O32

Chemical composition

Aluminium, Calcium, Natrium, Silicium, Sauerstoff, Vakanz

Unit weight: 1150.574526805 u; Number of atoms in the formula: 56

Info

Empirical formula:

(Ca0.75Vc0.25)2Na6Al8Si8O32

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Vacancy

Vc

0.00

0.5

0.89

0.0000000

0.0000000
Oxygen

O

44.50

32

57.14

15.9994300

511.9817600
Sodium

Na

11.99

6

10.71

22.9897702

137.9386212
Aluminium

Al

18.76

8

14.29

26.9815382

215.8523056
Silicon

Si

19.53

8

14.29

28.0855300

224.6842400
Calcium

Ca

5.23

1.5

2.68

40.0784000

60.1176000

Strunz 9th edition incl. updates

9.FA.05

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
05:Nephelin-Gruppe

Lapis Classification

VIII/J.02-003

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
2: Ohne tetraederfremde Anionen

IMA status

anerkannt - CNMNC Newsletter November 2016

Mineral status

anerkanntes Mineral

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

9.982(1)

Cell parameters b (Å)

-

Cell parameters c (Å)

8.364(2)

Cell parameters a/b or c/a

0.838

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Volume (ų)

721.738

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

4.322(27),
4.182(66),
3.840(93),
3.267(71),
3.006(100),
2.882(41),
2.343(54),
2.305(31)
XRD chart Davidsmithite

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

(Co-)Type locality

(Co-)Type locality

Norwegen/Vestland, Provinz/Selje/Liset/Liset Eklogit-Vorkommen

Type material

Muséum National d'Histoire Naturelle, Paris, Frankreich

Collection number of type material

MNHN215-001

Preface

Author (Name, Year)

Sid-Ali Kechid, Roberta Oberti, Giuseppe Rossi†, Giancarlo Parodi und Sylvain Pont (2016)

References

Smith, D.C., Kechid, S-A. and Rossi, G. - Occurence and properties of lisetite, CaNa2Al4Si4O16, a new tectosilicate in the system Ca-Na-Al-Si-O. American Mineralogist 71 (1986), 1372-1377 [als K-armes, Ca-reiches Nephelin Struktur Mineral]

Kechid, S.-A., Oberti, R., Rossi, G., Parodi, G. and Pont, P. (2016) Davidsmithite, IMA 2016-070. CNMNC Newsletter No. 34, December 2016, page 1317; Mineralogical Magazine, 80, 1315–1321

Names

UM1986-//-SiO:AlCa

Other languages

German

Davidsmithit

English

Davidsmithite

Russian

Давидсмисит

CNMNC (IMA)-Number

IMA 2016-070

CNMNC symbol

Symbol

Dsm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) WzGrMoGe3UqxsYv18coHHA
GUID (Global unique identifier) 32AB315B-9E81-4ADD-B1B1-8BF5F1CA071C
Database ID 8269