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About WalstromiteHide

Colourless to white
Sub-Vitreous, Pearly
Crystal System:
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

Approval Year:

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

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

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

Physical Properties of WalstromiteHide

Sub-Vitreous, Pearly
Transparent, Translucent
Colourless to white
3½ on Mohs scale

Optical Data of WalstromiteHide

Biaxial (-)
RI values:
nα = 1.668 nβ = 1.684 nγ = 1.685
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:

Chemical Properties of WalstromiteHide

IMA Formula:
Common Impurities:

Crystallography of WalstromiteHide

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

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000165WalstromiteDent Glasser L S, Glasser F P (1968) The crystal structure of walstromite American Mineralogist 53 9-1319680293
0018336WalstromiteBarkley M C, Downs R T, Yang H (2011) Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II American Mineralogist 96 797-8012011Esquire No. 8 claim, Big Creek, Fresno County, California, U.S.A.0293
0007324WalstromiteDorsam G, Liebscher A, Wunder B, Franz G, Gottschalk M (2009) Crystal structure refinement of synthetic Ca0.43Sr0.57[SiO3]-walstromite and walstromite-fluid Ca-Sr distribution at upper-mantle conditions European Journal of Mineralogy 21 705-7142009synthetic0293
0011105WalstromiteJoswig W, Paulus E F, Winkler B, Milman V (2003) The crystal structure of CaSiO3-walstromite, a special isomorph of wollastonite-II Zeitschrift fur Kristallographie 218 811-81820030293
0014201WalstromiteBasciano L C (1999) Mineralogy and crystal structures of barium silicate minerals from Fresno County, California Master's Thesis, University of British Columbia 1999 1-1641999Esquire #7, Big Creek, Fresno County, California, USA0293
CIF Raw Data - click here to close

Type Occurrence of WalstromiteHide

Synonyms of WalstromiteHide

Other Language Names for WalstromiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Walstromite associated with CelsianBa(Al2Si2O8)
6 photos of Walstromite associated with SanborniteBa2(Si4O10)
4 photos of Walstromite associated with BaziriteBaZr(Si3O9)
4 photos of Walstromite associated with AragoniteCaCO3
3 photos of Walstromite associated with QuartzSiO2
3 photos of Walstromite associated with TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx

Related Minerals - Nickel-Strunz GroupingHide

9.CA.05BenitoiteBaTi(Si3O9)Hex. 6 m2 : P62c
9.CA.15CalciocatapleiiteCaZr(Si3O9) · 2H2OOrth.
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,Mn2+)2(Si3O9)Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3Si4O10(OH)2 · 4H2O (?)Mon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
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
14.7.22GageiteMn21(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.
  • Yukon
    • Watson Lake mining district
      • Itsi Mountain
        • Wilson Lake
RRUFF collection, ID R150079.; Dunning, G.E., Walstrom, R.E., Lechner, W. (2018) Barium Silicate Mineralogy of the Western Margin, North American Continent, Part Geology, Origin, Paragenesis and Mineral Distribution from Baja California Norte, Mexico, Western Canada and Alaska, USA. Baymin Journal: 19(5): 70 pgs.
  • Southern District (HaDarom District)
    • Tamar Regional Council
Galuskin, E.V., Gfeller, F., Galuskina, I.O., Pakhomova, A., Armbruster, T., Vapnik, Y., Włodyka, R., Dzierżanowski, P., Murashko, M. (2015): New minerals with a modular structure derived from hatrurite from the pyrometamorphic Hatrurim Complex. Part II. Zadovite, BaCa6[(SiO4)(PO4)](PO4)2F and aradite, BaCa6[(SiO4)(VO4)](VO4)2F, from paralavas of the Hatrurim Basin, Negev Desert, Israel. Mineralogical Magazine, 79, 1073-1087.
      • Hatrurim Basin
Arkadiusz Krzątała, Evgeny V. Galuskin, Irina O. Galuskina, Yevgeny Vapnik (2018) “Uranian cuspidine” – a potentially new mineral from paralava of Eastern Gurim, Hatrurim Complex, Israel. in abstracts of the 22nd IMA Meeting Melbourne p 358; Krzątała, A.; Krüger, B.; Galuskina, I.; Vapnik, Y.; Galuskin, E. (2020) Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel. Minerals 10, 407.
Krzątała, A.; Krüger, B.; Galuskina, I.; Vapnik, Y.; Galuskin, E. (2020) Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel. Minerals 10, 407.
  • Baja California
    • Ensenada Municipality
      • 62 kilometers southeast of Ensenada
        • near El Alamo
Richard Gunter Collection
Middle East
Vapnik, Y., Galuskina, I., Murashko, M., Britvin, S., & Galuskin, E. (2014). The Hatrurim Complex-the New Unique Locality on World Mineral Map: the Review of Mineral Discoveries. In Israel Geological Society 2014, Annual Meeting, En Boqeq (pp. 143-144).
  • California
    • Fresno Co.
      • Big Creek-Rush Creek Mining 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
Robert E. Walstrom Collection
Robert E. Walstrom Collection
Eckhard D. Stuart and Robert E. Walstrom
    • Mariposa Co.
      • East Belt
        • Clearing House Mining 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
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