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Slawsonite

Additional Functions

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

Volumne (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


 
 
 
 
 

 
 
 
(Na,K)AlSi3O8
triklin
C1

 
 
 
(NH4)AlSi3O8·0.5 H2O
monoklin
P21, P21/m

 
 
 
BaAl2Si2O8
monoklin
I2/c

 
 
 
(K,Ba)Al(Si,Al)3O8
monoklin
C2/m

 
 
 
KAlSi3O8
triklin
C1

 
 
 
KAlSi3O8
monoklin
C2/m

 
 
 
(Rb,K)[AlSi3O8]
triklin
P1

 
 
 
(K,Na)(Si,Al)4O8
monoklin
C2/m

 
 
BaNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
hexagonal
P6/mmm

 
 
K[(Al,Zn)2(As,Si)2O8]
monoklin
I2/c

 
 
KAlSi3O8
hexagonal
P6/mmm

 
 
(Na,Ca)AlSi3O8
tetragonal
I4/m

 
 
BaAl2Si2O8
monoklin
P21/a

 
 
 
 
 

 
 
 
NaAlSi3O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
P1

 
 
 
CaAl2Si2O8
triklin
P1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
I1

 
 
 
(Ca,Na)(Si,Al)4O8
triklin
C1

 
 
 
(Na,Ca)(Si,Al)4O8
triklin
C1

 
 
NaBSi3O8
triklin
C1

 
 
(Sr,Ca)Al2Si2O8
monoklin
P21/a

 
 
SrNa2Al4Si4O16
orthorhombisch
Iba2

 
 
CaAl2Si2O8
orthorhombisch
P21212

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Actuality: 21. Jun 2022 - 08:21:00

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

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Russian pages

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