Pseudowollastonite (original) (raw)

A material that is NOT an approved mineral species

About PseudowollastoniteHide

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This formula only indicates the stoichiometry of the mineral. In order to reflect the structural units the mineral is composed of, the formula may also be written as Ca(Si3O9)0.33 or as Ca3(Si3O9).

Crystal System:

Monoclinic

Name:

After chemical relationship to wollastonite.

Well known as an artificial high-temperature phase dimorphous with Wollastonite from slags and cement, but also very rare found in nature from pyrometamorphosed calcareous rocks and a melitolite.

The structure contains isolated trisilicate rings (Si3O9)6-.

A possible Mn analogue, UM1975-18-SiO:Mn, the alpha phase of MnSiO3, is known to occur in limestones of Polish Tatra Mts.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:9535:4

58f612a8-b8b0-4c0c-a8f4-b29729f7f8a4

IMA Classification of PseudowollastoniteHide

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'Grandfathered' (first described prior to 1959)

Classification of PseudowollastoniteHide

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9.CA.20

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

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.

Pronunciation of PseudowollastoniteHide

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Pronunciation:

Physical Properties of PseudowollastoniteHide

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Comment:

Estimated from refractive indices

Chemistry of PseudowollastoniteHide

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Mindat Formula:

CaSiO3

This formula only indicates the stoichiometry of the mineral. In order to reflect the structural units the mineral is composed of, the formula may also be written as Ca(Si3O9)0.33 or as Ca3(Si3O9).

Crystallography of PseudowollastoniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 6.83556(10) Å, b = 11.86962(18) Å, c = 19.6255(3) Å
α = 90°, β = 90.6805(13)°, γ = 90°

Ratio:

a:b:c = 0.576 : 1 : 1.653

Morphology:

Platy on {001}

Twinning:

Polysynthetic, presumably || structural layers {001}

Comment:

Strongly pseudohexagonal metric; data is for 4M polytype (2M and 6-layer polytypes also known for synthetic analogue)

Geological EnvironmentHide

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Synonyms of PseudowollastoniteHide

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Other Language Names for PseudowollastoniteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Lilac cathodoluminescence reported by Seryotkin et al. (2012)

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 PseudowollastoniteHide

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References for PseudowollastoniteHide

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Reference List:

Dera, P., Rapp, R., Chornkrathok, S., Zhang, D., Prakapenka, V.B., Woźniak, K. (2023). New high-pressure phase of CaSiO3 wollastonite with penta-coordinated silicon. 9th Meeting of the Mineralogical Society of Poland / 28th Meeting of the Petrology group of the Mineralogical Society of Poland, "Oceanic lithosphere: rocks, minerals, and critical resources", October 19-22, Bielawa, Poland. Mineralogia - Special Papers, 51, 51.

Sokol, E.V., Novikov, I.S., Zateeva, S.N., Sharygin, V.V., Vapnik, Ye. (2008) Pyrometamorphic rocks of the spurrite–merwinite facies as indicators of discharge zones of hydrocarbons (the Hatrurim Formation, Israel). Doklady Earth Sciences: 420: 608–614.

Sokol, E., Novikov, I., Zateeva, S., Vapnik, Ye, Shagam, R., Kozmenko, O. (2010) Combustion metamorphism in Nabi Musa dome: new implications for a mud volcanic origin of the Mottled Zone, Dead Sea area. Basin Research: 22: 414–438.

Localities for PseudowollastoniteHide

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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.