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Walstromite

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About WalstromiteHide

Formula:
BaCa2(Si3O9)
Colour:
Colourless to white
Lustre:
Sub-Vitreous, Pearly
Hardness:
Crystal System:
Triclinic
Name:
Named after Robert "Bob" E. Walstrom, geologist and mineral collector, formerly of Fresno, CA, and now of Silver City, NM, USA. He has 12 minerals new to science to his credit, already published (2008), with more in the works.
Isostructural with:
The Ba analogue of margarosanite. Chemically similar to macdonaldite which, however, is basic and contains water.


Classification of WalstromiteHide

Approved
Approval Year:
1964
9.CA.25

9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
59.1.2.1

59 : CYCLOSILICATES Three-Membered Rings
1 : Three-Membered Rings, anhydrous, no other anions
14.7.3

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Physical Properties of WalstromiteHide

Sub-Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
Colourless to white
Hardness:
3½ on Mohs scale

Optical Data of WalstromiteHide

Type:
Biaxial (-)
RI values:
nα = 1.668 nβ = 1.684 nγ = 1.685
2V:
Measured: 30° , Calculated: 26°
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak

Chemical Properties of WalstromiteHide

Formula:
BaCa2(Si3O9)
IMA Formula:
BaCa2Si3O9
Common Impurities:
Ti,Al,Fe,Mn,Mg,Sr,K

Crystallography of WalstromiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 6.74 Å, b = 9.6 Å, c = 6.68 Å
α = 69.85°, β = 102.23°, γ = 97.11°
Ratio:
a:b:c = 0.702 : 1 : 0.696
Unit Cell V:
395.95 ų (Calculated from Unit Cell)

Type Occurrence of WalstromiteHide

Synonyms of WalstromiteHide

Other Language Names for WalstromiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Celsian6 photos of Walstromite associated with Celsian on mindat.org.
Sanbornite6 photos of Walstromite associated with Sanbornite on mindat.org.
Bazirite4 photos of Walstromite associated with Bazirite on mindat.org.
Aragonite4 photos of Walstromite associated with Aragonite on mindat.org.
Quartz3 photos of Walstromite associated with Quartz on mindat.org.
Titantaramellite3 photos of Walstromite associated with Titantaramellite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CA.05BaziriteBaZr(Si3O9)Hex.
9.CA.05BenitoiteBaTi(Si3O9)Hex. 6 m2 : P62c
9.CA.05PabstiteBa(Sn,Ti)(Si3O9)Hex.
9.CA.10WadeiteK2Zr(Si3O9)Hex.
9.CA.15CalciocatapleiiteCaZr(Si3O9) · 2H2O
9.CA.15CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
9.CA.20PseudowollastoniteCaSiO3Mon. 2/m : B2/b
9.CA.25MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1
9.CA.30Bobtraillite(Na,Ca)13Sr11(Zr,Y,Nb)14(Si3O9)10(H2BSi2O9)6 · 12H2OTrig. 3m (3 2/m) : P3 1c

Related Minerals - Dana Grouping (8th Ed.)Hide

59.1.2.2MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.1SanborniteBa2(Si4O10)Orth.
14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.6Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
14.7.7GillespiteBaFe2+Si4O10Tet.
14.7.8AndrémeyeriteBaFe2+2(Si2O7)Mon.
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17Orth.
14.7.10TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon.
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.17JunitoiteCaZn2Si2O7 · H2OOrth. mm2
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2Orth.
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for WalstromiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1965): 50: 314-340.
Glasser, L.S.D. & F.P. Glasser (1968), The crystal structure of walstromite: American Mineralogist: 53: 9-13.
American Mineralogist (1984): 69: 358.

Internet Links for WalstromiteHide

Localities for WalstromiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Yukon
    • Watson Lake mining district
      • Itsi Mt.
        • Wilson Lake
RRUFF collection
USA (TL)
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
          • Big Creek
[Amer.Min.(1965) 50, 314-340; MinRec 33:161]; American Mineralogist (1981), Volume 66, pages 1050-1053
Bob Walstrom, p.c.
          • Rush Creek
Eckhard D. Stuart and Robert E. Walstrom
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
[MinRec 30:414]; American Mineralogist (1981), Volume 66, pages 1050-1053
    • Tulare Co.
      • Dumtah
Mineralogical Record: 34(2): 159-166
Mineral and/or Locality  
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