Walstromite (original) (raw)

A valid IMA mineral species

About WalstromiteHide

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Colour:

Colourless to white

Lustre:

Sub-Vitreous, Pearly

Name:

Named after Robert "Bob" E. Walstrom (1937, Lebanon, Missouri, USA - 3 February 2022), geologist and mineral collector, formerly of Fresno, CA, later of Silver City, NM, USA. He has 12 minerals new to science to his credit, already published (2008), with more in the works.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4239:6

4ca9a9d0-40ba-4324-bd8d-a1c74e2bda2f

IMA Classification of WalstromiteHide

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Type description reference:

Classification of WalstromiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of WalstromiteHide

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Transparency:

Transparent, Translucent

Comment:

Pearly on cleavages

Colour:

Colourless to white

Cleavage:

Perfect
{011}, {010}, and {100}.

Density:

3.67(6) g/cm3 (Measured) 3.738 g/cm3 (Calculated)

Optical Data of WalstromiteHide

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RI values:

_n_α = 1.668(2) _n_β = 1.684(2) _n_γ = 1.685(2)

2V:

Measured: 30° , Calculated: 28°

δ = 0.017

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of WalstromiteHide

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Mindat Formula:

BaCa2(Si3O9)

Common Impurities:

Ti,Al,Fe,Mn,Mg,Sr,K

Crystallography of WalstromiteHide

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Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 6.7335 Å, b = 9.6142(3) Å, c = 6.6859(2) Å
α = 69.638(2)°, β = 102.281(2)°, γ = 96.885(2)°

Ratio:

a:b:c = 0.7 : 1 : 0.695

Unit Cell V:

396.00 ų (Calculated from Unit Cell)

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000165	Walstromite	Dent Glasser L S, Glasser F P (1968) The crystal structure of walstromite American Mineralogist 53 9-13		1968	0	293
0018336	Walstromite	Barkley M C, Downs R T, Yang H (2011) Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II American Mineralogist 96 797-801	2011	Esquire No. 8 claim, Big Creek, Fresno County, California, U.S.A.	0	293
0007324	Walstromite	Dorsam 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 21 705-714	2009	synthetic	0	293
0011105	Walstromite	Joswig W, Paulus E F, Winkler B, Milman V (2003) The crystal structure of CaSiO3-walstromite, a special isomorph of wollastonite-II Zeitschrift fur Kristallographie 218 811-818	2003	0	293
0014201	Walstromite	Basciano L C (1999) Mineralogy and crystal structures of barium silicate minerals from Fresno County, California Master's Thesis, University of British Columbia 1999 1-164	1999	Esquire #7, Big Creek, Fresno County, California, USA	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of WalstromiteHide

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General Appearance of Type Material:

Individual disseminated grains, or concentrated in layers. Grains reach 12 x 6 x 6 mm.

Place of Conservation of Type Material:

California Division of Mines & Geology, San Francisco, California, USA.

Geological Setting of Type Material:

Sanbornite-quartz rock, especially where the quartz content is high.

Associated Minerals at Type Locality:

Reference:

Alfors, J.T., Stinson, M.C., Matthews, R.A., Pabst, A. (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist: 50: 314-340.

Synonyms of WalstromiteHide

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Other Language Names for WalstromiteHide

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Relationship of Walstromite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of WalstromiteHide

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Dull pink under SW UV; bright pink under LW UV.

Other InformationHide

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Thermal Behaviour:

Fuses to a clear glass at about 4.

On heating in an electric furnace it shows no change in appearance until 1200 °C, when it partially melts to a colorless glass.

Notes:

Readily decomposed by cold dilute acids leaving a white silica residue, but not affected by bases.

Health Risks:

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

Internet Links for WalstromiteHide

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References for WalstromiteHide

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Reference List:

Krzątała, Arkadiusz, Krüger, Biljana, Galuskina, Irina, Vapnik, Yevgeny, Galuskin, Evgeny (2020) Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel. Minerals, 10 (5) 407 doi:10.3390/min10050407

Localities for WalstromiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.