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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 2013-10-23
Locality: Kurumazawa Gabbro-Steinbruch / Katashina / Gunma, Präfektur / Kanto, Region / Honshu / 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

Volumne (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

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.

IMA group assignments

Other languages

German

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Spanish

Dmisteinbergita

French

Dmisteinbergite

English

Dmisteinbergite

Russian

Дмиштейнбергит

CNMNC (IMA)-Number

IMA 1989-010

CNMNC symbol

Symbol

Dsb

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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Russian pages

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Mineral Dealer

German pages

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