Pseudowollastonite
A valid IMA mineral species - grandfathered
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About Pseudowollastonite
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).
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
After chemical relationship to wollastonite.
Polymorph of:
Well known as an artificial high-temperature phase dimorphous with wollastonite from slags and cement, but also very rarely found in nature in pyrometamorphosed calcareous rocks and a melilitolite. Considered a valid species by the IMA-CNMNC.
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.
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 Identifiers
Mindat ID:
9535
Long-form identifier:
mindat:1:1:9535:4
IMA Classification of Pseudowollastonite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Pseudowollastonite
9.CA.20
9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
A : [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pwo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Pseudowollastonite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Pseudowollastonite
Chemistry of Pseudowollastonite
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).
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).
Element Weights:
Elements listed:
Crystallography of Pseudowollastonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
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°
α = 90°, β = 90.6805(13)°, γ = 90°
Ratio:
a:b:c = 0.576 : 1 : 1.653
Unit Cell V:
1592.22 ų
Z:
8
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 Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| 51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) | |
| 56 : Slag and smelter minerals (see also #51 and #55) |
Synonyms of Pseudowollastonite
Other Language Names for Pseudowollastonite
Common Associates
Associations Based on Photo Data:
| 2 photos of Pseudowollastonite associated with Melilite Group | Ca2M(XSiO7) |
Related Minerals - Strunz-mindat Grouping
| 9.CA. | 'UM1975-18-SiO:Mn' | α-MnSiO3 |
| 9.CA. | Raudseppite | Ba2Ca7(Si3O9)2(CO3)2Cl2 |
| 9.CA. | Kopylovite | K2Ti(Si3O9) |
| 9.CA.05 | Bazirite | BaZr(Si3O9) |
| 9.CA.05 | Benitoite | BaTi(Si3O9) |
| 9.CA.05 | Pabstite | Ba(Sn,Ti)(Si3O9) |
| 9.CA.10 | Wadeite | K2Zr(Si3O9) |
| 9.CA.15 | Calciocatapleiite | CaZr(Si3O9) · 2H2O |
| 9.CA.15 | Catapleiite | Na2Zr(Si3O9) · 2H2O |
| 9.CA.25 | Margarosanite | Ca2PbSi3O9 |
| 9.CA.25 | Walstromite | BaCa2(Si3O9) |
| 9.CA.25 | Anatolygurbanovite | SrCa2Si3O9 |
| 9.CA.25 | Breyite | Ca3Si3O9 |
| 9.CA.30 | Bobtraillite | (Na,◻)12(◻,Na)12Sr12Zr14(Si3O9)10[Si2BO7(OH)2]6 · 12H2O |
| 9.CA.35 | Rogermitchellite | Na6Sr12Ba2Zr13Si39B4O123(OH)6 · 20H2O |
Other Information
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 Pseudowollastonite
mindat.org URL:
https://www.mindat.org/min-9535.html
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Please feel free to link to this page.
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References for Pseudowollastonite
Reference List:
McLintock, W. F. P. (1932) On the Metamorphism Produced by the Combustion of Hydrocarbons in the Tertiary Sediments of South-West Persia. Mineralogical Magazine, 23 (139). 207-226 doi:10.1180/minmag.1932.023.139.01
TOLLIDAY, JOAN (1958) Crystal Structure of β-Wollastonite. Nature, 182 (4641). 1012-1013 doi:10.1038/1821012a0
Gross, S. (1977) The mineralogy of the Hatrurim formation, Israel. Geological Survey of Israel, Bulletin 70: 1-80.American Mineralogist (1999): 84: 929.
Ohsato, H., Sugimura, T. (1986) Morphology of synthetic β-wollastonite and para-wollastonite. Journal of Crystal Growth, 74 (3). 656-658 doi:10.1016/0022-0248(86)90212-5
Courtial, P., Téqui, C., Richet, P. (2000) Thermodynamics of diopside, anorthite, pseudowollastonite, CaMgGeO4 olivine, and åkermanite up to near the melting point. Physics and Chemistry of Minerals, 27 (4). 242-250 doi:10.1007/s002690050253
Bouhifd, M. A., Gruener, G., Mysen, B. O., Richet, P. (2002) Premelting and calcium mobility in gehlenite (Ca2Al2SiO7) and parawollastonite (CaSiO3). Physics and Chemistry of Minerals, 29 (10). 655-662 doi:10.1007/s00269-002-0276-0
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 hydrocarbon discharge zones (the Hatrurim formation, Israel) Doklady Earth Sciences, 420 (1) 608-614 doi:10.1134/s1028334x08040181
Stoppa, Francesco, Sharygin, Victor V. (2009) Melilitolite intrusion and pelite digestion by high temperature kamafugitic magma at Colle Fabbri, Spoleto, Italy. Lithos, 112 (3) 306-320 doi:10.1016/j.lithos.2009.03.001
Localities for Pseudowollastonite
Showing 14 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
France | |
| publication date: November 2018 +2 other references |
Germany | |
| Gerstenberg (n.d.) |
Israel | |
| Galuskin et al. (2015) |
| Galuskina et al. (2017) +1 other reference |
| Galuskin et al. (2023) +1 other reference | |
| Galuskin et al. (2024) |
| Galuskin et al. (2022) +1 other reference | |
| Galuskin et al. (2016) | |
Italy | |
| Stoppa et al. (2009) |
Middle East | |
| Gross (1977) | |
Palestine | |
| Seryotkin et al. (2012) |
Poland | |
| Łukasz Kruszewski PXRD data |
| Cu +2 other references |
USA | |
| Wenk (1969) +2 other references |
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Lapanouse-de-Sévérac slag locality, Sévérac-d'Aveyron, Rodez, Aveyron, Occitanie, France