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Davisite

Collectors Summary

Crystal System monoklin, C2/c

Chemism

Chemical formula

CaScAlSiO6

Additional chem. information

Pyroxen-Gruppe

Chemical composition

Aluminium, Calcium, Scandium, Silicium, Sauerstoff

Unit weight: 236.097959 u; Number of atoms in the formula: 10

Info

Empirical formula:

CaScAlSiO6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

40.66

6

60.00

15.9994300

95.9965800

Aluminium

Al

11.43

1

10.00

26.9815382

26.9815382

Silicon

Si

11.90

1

10.00

28.0855300

28.0855300

Calcium

Ca

16.98

1

10.00

40.0784000

40.0784000

Scandium

Sc

19.04

1

10.00

44.9559108

44.9559108

Analysis wt%

SiO2 : 26.24, ZrO2 : 2.00, TiO2 : 3.57, Ti2O3 : 4.64, Al2O3 : 21.05, Sc2O3 : 14.70, V2O3 : 0.55, MgO : 2.82, Y2O3 : 0.56, CaO : 23.55, Ln2O3 : 1.04 (Ref: American Mineralogist 2009)

Strunz 9th edition incl. updates

9.DA.15

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
A: Ketten- und Bandsilikate mit 2 periodischen Ketten SiO6; Pyroxen-Familie
15:Ca Klinopyroxene; Diopsid-Gruppe

Lapis Classification

VIII/F.01-115

VIII: SILIKATE
F: Ketten- und Bandsilikate
1: Zweierketten [Si2O6] 4-; Pyroxen-Gruppe; Klinopyroxene

Classification by Hölzel

9.DC.230

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
C: Augite-Group

IMA status

anerkannt - IMA WEB Seite - Neue Mineralien Sept. 2008

Mineral status

anerkanntes Mineral

Optical Properties

2V angle

Biaxial

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

9.884

Cell parameters b (Å)

8.988

Cell parameters c (Å)

5.446

Cell parameters a/b or c/a

1.100

Cell parameters c/b

0.606

Cell parameters α

90°

Cell parameters β

105.87

Cell parameters γ

90°

Z

4

Volume (ų)

465.368

X-Ray Powder Diffraction

3.039(100), 2.989(33), 2.619(39), 2.600(28), 2.564(47), 2.159(16), 2.063(22), 1.676(16)

XRD chart Davisite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.38 (berechnet)

3.37 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Chi Ma, 2008

References

IMA WEB Seite - Neue Mineralien Sept. 2008

American Mineralogist, Volume 94, pages 845.848 (2009)

Other languages

German

Davisit

Spanish

Davisita

English

Davisite

Russian

Дэвисит

Simplified Chinese

钪辉石

CNMNC (IMA)-Number

IMA 2008-030

CNMNC symbol

Symbol

Dav

Locations with GPS information

IDs

GUSID (Global unique identifier short form) _tfuRRxVzUu-fhYbaZxI1A
GUID (Global unique identifier) 45EED7FE-551C-4BCD-BE7E-161B699C48D4
Database ID 4975