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Slawsonite

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Slawsonit
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Slawsonit
Farblos-weißlichgraue Slawsonit-Kristallaggregate; ohne Maßstab, FO: Kagami, Kochi City, Kochi Prefecture, Shikoku Island, Japan.
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Japan/Shikoku (Schikoku), Insel/Kochi, Präfektur/Kochi/Kagami
Mineral: Slawsonite
Image: 1702143681
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Slawsonit

Farblos-weißlichgraue Slawsonit-Kristallaggregate; ohne Maßstab, FO: Kagami, Kochi City, Kochi Prefecture, Shikoku Island, Japan.
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2023-12-09
Locality: Kagami / Kochi / Kochi, Präfektur / Shikoku (Schikoku), Insel / Japan

Collectors Summary

Color farblos, mittelgrau
Streak color weiß
Hardness (Mohs) 6.25
Crystal System monoklin, P21/a

Chemism

Chemical formula

(Sr,Ca)Al2Si2O8

Chemical composition

Aluminium, Calcium, Silicium, Strontium, Sauerstoff

Unit weight: 313.8649264 u; Number of atoms in the formula: 13

Info

Empirical formula:

(Sr0.75Ca0.25)Al2Si2O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

40.78

8

61.54

15.9994300

127.9954400
Aluminium

Al

17.19

2

15.38

26.9815382

53.9630764
Silicon

Si

17.90

2

15.38

28.0855300

56.1710600
Calcium

Ca

3.19

0.25

1.92

40.0784000

10.0196000
Strontium

Sr

20.94

0.75

5.77

87.6210000

65.7157500

Analysis wt%

SiO2 : 36.63, Al2O3 : 31.30, SrO : 29.99, BaO : 1.53 (Ref: Bull.Natn.Sci.Mus.,Tokyo,85)

Strunz 9th edition incl. updates

9.FA.50

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen]
50:

Lapis Classification

VIII/J.06-080

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

Classification by Hölzel

9.FC.200

9: SILICATES
F: Tektosilicates
C: Feldspar-Group

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Feldspar group

Optical Properties

Color

farblos, mittelgrau

Streak color

weiß

Diaphaneity (Transparency)

Semitransparent

max. Birefringence

0.016
Birefringence chart\! Slawsonite title=Birefringence chart Slawsonite

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

1.570

RI value β

1.582

RI value γ / ε

1.586

Ri mean

1.579

2V angle

Biaxial (-) 55°

Optical Data Luminescence

Luminescence

fluoreszierend, Kurzwelliges UV=rosafarben rot lila

Color SW-UV (254nm)

  

violettrot

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

8.910

Cell parameters b (Å)

9.343

Cell parameters c (Å)

8.345

Cell parameters a/b or c/a

0.954

Cell parameters c/b

0.893

Cell parameters α

90°

Cell parameters β

90.0

Cell parameters γ

90°

Z

4

Volume (ų)

694.689

X-Ray Powder Diffraction

6.56(30),
3.77(40),
3.45(70),
3.29(90),
3.24(100),
2.99(40),
2.75(40),
2.56(60)
XRD chart Slawsonite

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)

6.25

VHN (Hardness Vickers)

850 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.05 - 3.5 / Durchschnittlich = 3.27

3.001 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Oregon/Wallowa Co./Martin Bridge Formation

Preface

Rareness

Sehr selten

Author (Name, Year)

Griffen & Ribbe & Gibbs, 1977

Additional Information

Feldspat-Gruppe (Buddingtonit-Orthoklas-Slawsonit-Serie)

References

American Mineralogist 47 (1962), 291.

American Mineralogist 62 (1977), 31.

American Mineralogist 72 (1987), 225.

Zeitschrift für Kristallographie 210 (1995), 741.

Liudmila Gorelova, Oleg Vereshchagin and Anatoly Kasatkin: Thermal Expansion and Polymorphism of Slawsonite SrAl2Si2O8. Minerals Vol. 11, Nr. 10 (2021) Art.-Nr. 1150.

IMA group assignments

Other languages

German

Slawsonit

Spanish

Slawsonita

English

Slawsonite

French

Slawsonite-1A

Russian

Слаусонит

Alternative Name

Slawsonita

CNMNC (IMA)-Number

IMA 1967-026

CNMNC symbol

Symbol

Sws

IDs

GUSID (Global unique identifier short form) TWKvBIAk6EaWcHT347QoeQ
GUID (Global unique identifier) 04AF624D-2480-46E8-9670-74F7E3B42879
Database ID 3556