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Dmisteinbergite

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Dmisteinbergit
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Dmisteinbergit
Kurumazawa Metagabbro Steinbruch, Katashina, Gunma, Kanto, Honshu, Japan; Bildbreite ca. 2.3 cm
Copyright: Stefan; Contribution: Stefan
Location: Japan/Honshū (Honschu), Insel/Kanto, Region/Gunma, Präfektur/Katashina/Kurumazawa Gabbro-Steinbruch
Mineral: Dmisteinbergite
Image: 1382557181
License: Usage for Mineralienatlas project only
Dmisteinbergit

Kurumazawa Metagabbro Steinbruch, Katashina, Gunma, Kanto, Honshu, Japan; Bildbreite ca. 2.3 cm
Copyright: Stefan
Contribution: Stefan 2013-10-23
Locality: Kurumazawa Gabbro-Steinbruch / Katashina / Gunma, Präfektur / Kanto, Region / Honshū (Honschu), Insel / Japan

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 6
Cleavages vollkommen {001}
Fracture muschelig
Solubility ++ HCl
Crystal System hexagonal, P6/mmm

Chemism

Chemical formula

CaAl2Si2O8

Additional chem. information

Produkt aus brennenden Kohleflötzen

Chemical composition

Aluminium, Calcium, Silicium, Sauerstoff

Unit weight: 278.2079764 u; Number of atoms in the formula: 13

Info

Empirical formula:

CaAl2Si2O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

46.01

8

61.54

15.9994300

127.9954400
Aluminium

Al

19.40

2

15.38

26.9815382

53.9630764
Silicon

Si

20.19

2

15.38

28.0855300

56.1710600
Calcium

Ca

14.41

1

7.69

40.0784000

40.0784000

Analysis wt%

Ø CaO : 19.29, Al2O3 : 35.39, SiO2 : 43.89 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 90)

Strunz 9th edition incl. updates

9.EG.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen
15:Dmisteinbergit-Gruppe

Lapis Classification

VIII/J.07-075

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
7: Ohne tetraederfremde Anionen; Feldspat-Gruppe

Classification by Hölzel

9.FA.400

9: SILICATES
F: Tektosilicates
A: Without other tetrahedral Anions

Hey's Chemical Index of Minerals

16.09.05

16: Silicates Containing Aluminum and other Metals
09: Aluminosilicates of Ca

Dana 8th edition

76.01.07.01

76: Tektosilicates Tectosilicate Al-Si Framework
01: Tektosilicates Tectosilicate Al-Si Framework with Al-Si frameworks

IMA status

anerkannt 1989

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Feldspar group

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.005
Birefringence chart\! Dmisteinbergite title=Birefringence chart Dmisteinbergite

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

1.575

RI value γ / ε

1.580

Ri mean

1.577

2V angle

Uniaxial (+)

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

191

Space Group

P6/mmm

Cell parameters a (Å)

5.122

Cell parameters b (Å)

-

Cell parameters c (Å)

14.781

Cell parameters a/b or c/a

2.886

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volume (ų)

335.825

X-Ray Powder Diffraction

4.48(60),
3.83(60),
3.73(100),
2.85(70),
2.57(80),
2.14(30),
1.847(70),
1.481(40)
XRD chart Dmisteinbergite

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)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.73 (gemessen) 2.747 (berechnet)

2.751 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

muschelig

Tenacity

spröde

Instability

++ HCl

(Co-)Type locality

(Co-)Type locality

Russland/Ural, Föderationskreis/Tscheljabinsk, Oblast/Tscheljabinsk Kohlebecken/Kopeisk

Russland/Ural, Föderationskreis/Tscheljabinsk, Oblast/Tscheljabinsk Kohlebecken/Kopeisk/Kohlegrube Nr. 45

Preface

Rareness

Sehr selten

Author (Name, Year)

Chesnokov & Lotova & Nigmatulina & Pavlyuchenko & Bushmakin, 1990

Additional Information

Feldspat-Gruppe (Anorthoklas-Anorthit-Banalsit-Serie)

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 119 (5) (1990), 43.

American Mineralogist 77 (1992), 446.

Acta Crystallographica 12 (1959), 465.

Iris Wannhoff; Silvio Ferrero;Alessia Borghini; Robert Darling; Patrick J. O’Brien: First evidence of dmisteinbergite (CaAl2Si2O8 polymorph) in high-grade metamorphic rocks. American Mineralogist Vol.107, Nr. 12 (2022) S. 2315–2319.

IMA group assignments

Other languages

German

Dmisteinbergit

Spanish

Dmisteinbergita

French

Dmisteinbergite

English

Dmisteinbergite

Russian

Дмиштейнбергит

CNMNC (IMA)-Number

IMA 1989-010

CNMNC symbol

Symbol

Dsb

Locations with GPS information

IDs

GUSID (Global unique identifier short form) KpAauG3Vi0WTFKy1P7VGrA
GUID (Global unique identifier) B81A902A-D56D-458B-9314-ACB53FB546AC
Database ID 949