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Walstromite (Walstromit)

Pictures (2 Images total)

Walstromit
Views (File:
1573026582
): 335
Walstromit
USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim. Bildbreite 1,2 mm
Copyright: Ulrich Baumgärtl; Contribution: Ulrich Baumgärtl
Collection: Ulrich Baumgärtl
Location: USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim
Mineral: Walstromite
Image: 1573026582
License: Usage for Mineralienatlas project only
Walstromit

USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim. Bildbreite 1,2 mm

Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: Ulrich Baumgärtl 2019-11-06
Locality: Esquire No. 7 Claim / Big Creek / Fresno Co. / Kalifornien (California) / USA
Walstromit
Views (File:
1573026740
): 309
Walstromit
USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim. Bildbreite 1,2 mm
Copyright: Ulrich Baumgärtl; Contribution: Ulrich Baumgärtl
Collection: Ulrich Baumgärtl
Location: USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim
Mineral: Walstromite
Image: 1573026740
License: Usage for Mineralienatlas project only
Walstromit

USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim. Bildbreite 1,2 mm

Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: Ulrich Baumgärtl 2019-11-06
Locality: Esquire No. 7 Claim / Big Creek / Fresno Co. / Kalifornien (California) / USA

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß
Streak color weiß
Lustre Subglasglanz, auf Spaltflächen Perlglanz
Hardness (Mohs) 3.5
Cleavages vollkommen {011}, {010}, {100}
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chemical formula

BaCa2Si3O9

Empirical formula (analysis)

(Ba0.96Sr0.02Ca0.02)Σ1(Ca1.98Mn0.02)Σ2Si3.00O9

Chemical composition

Barium, Calcium, Silicium, Sauerstoff

Unit weight: 443.094032998 u; Number of atoms in the formula: 15

Info

Empirical formula:

(Ba0.96Sr0.02Ca0.02)(Ca1.98Mn0.02)Si3.00O9

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

32.50

9

60.00

15.9994300

143.9948700

Silicon

Si

19.02

3

20.00

28.0855300

84.2565900

Calcium

Ca

18.09

2

13.33

40.0784000

80.1568000

Manganese

Mn

0.25

0.02

0.13

54.9380499

1.0987610

Strontium

Sr

0.40

0.02

0.13

87.6210000

1.7524200

Barium

Ba

29.75

0.96

6.40

137.3277000

131.8345920

Analysis wt%

SiO2 : 39.60, CaO : 26.10, BaO : 33.30, SrO : 0.53 (Ref: American Mineralogist 65)

Strunz 9th edition incl. updates

9.CA.25

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
A: ~[Si3O9]6- dreier-Einfachringe, ohne inselartig, komplexe [Anionen]
25:Walstromit-Gruppe

Lapis Classification

VIII/E.02-010

VIII: SILIKATE
E: Ringsilikate
2: Dreierringe [Si3O9] 6-

Classification by Hölzel

9.CA.500

9: SILICATES
C: Cyclosilicates
A: ~[Si3O9]6--Rings
5: Without Ti,Zr,Sn Walstromite-Group

Dana 8th edition

59.01.02.01

59: Cyclosilicate Minerals
01: Cyclosilicates Cyclosilicate Three-Membered Rings anhydrous, no other anions
02: Walstromite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Margarosanite group

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent, durchscheinend

Lustre

Subglasglanz, auf Spaltflächen Perlglanz

max. Birefringence

0.017

Birefringence chart\! Walstromite title=Birefringence chart Walstromite

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

1.668

RI value β

1.684

RI value γ / ε

1.685

Ri mean

1.679

2V angle

Biaxial (-) 30° (gemessen) 26° (berechnet)

Optical Data Luminescence

Luminescence

fluoreszierend, Kurzwelliges UV=blassrosa, Langwelliges UV=rosafarben orange

MW-UV (320nm)

 

orange

MW-UV Intensity

stark

Color SW-UV (254nm)

 

orange

SW-UV Intensity

mittel

SW-UV Other Colors

   

dunkelorange gelbbraun, orangerot

Most Common Activator

Mn2+

Other Activators

Eu2+

Color SW-UV Afterglow (254nm)

 

orange

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

6.7335(2)

Cell parameters b (Å)

9.6142(3)

Cell parameters c (Å)

6.6859(2)

Cell parameters a/b or c/a

0.7

Cell parameters c/b

0.695

Cell parameters α

69.638(2)

Cell parameters β

102.281(2)

Cell parameters γ

96.855(2)

Z

2

Volume (ų)

396.009

Crystal structure

Struktur aufgeklärt

X-Ray Powder Diffraction

6.58(20),
4.40(10),
3.35(10),
3.20(10),
3.06(10),
2.99(100),
2.78(10),
2.70(20)

XRD chart Walstromite

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)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.67 (gemessen); 3.73 (berechnet)

3.716 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {011}, {010}, {100}

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim

Type material

California Devision of Mines & Geology, San Francisco, California, USA

Preface

Name from

Der NAme ehrt E. Walstrom, Mineraliensammler aus Fresno, Kalifornien USA, welcher zuerst den unverwechselbaren Charakter des Minerals erkannte.

Author (Name, Year)

Alfors & Stinson & Matthews & Pabst, 1965

References

American Mineralogist 50 (1965), 314

Madison C. Barkley, Robert T. Downs, Hexiong Yang - Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II - American Mineralogist, Volume 96, pages 797–801, 2011 [u.a. Struktur]

IMA group assignments

Other languages

German

Walstromit

Spanish

Walstromita

French

Walstromite

English

Walstromite

Russian

Уолстромит

CNMNC (IMA)-Number

IMA 1964-009

CNMNC symbol

Symbol

Ws

Locations with GPS information

IDs

GUSID (Global unique identifier short form) NxAyUfUe60u1y6Ek8-ZNgw
GUID (Global unique identifier) 51321037-1EF5-4BEB-B5CB-A124F3E64D83
Database ID 4120