Pseudowollastonite
A material that is NOT an approved mineral species
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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 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.
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
GUID
(UUID V4):
(UUID V4):
58f612a8-b8b0-4c0c-a8f4-b29729f7f8a4
IMA Classification of Pseudowollastonite
'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 IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Pwo | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC 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).
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 Ă
Âł
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
Associated Minerals 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.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 | Pb(Ca,Mn2+)2(Si3O9) |
| 9.CA.25 | Walstromite | BaCa2(Si3O9) |
| 9.CA.25 | Breyite | Ca3Si3O9 |
| 9.CA.30 | Bobtraillite | (Na,â»)12(â»,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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References for Pseudowollastonite
Reference List:
Localities for Pseudowollastonite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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 | |
| Andreas Gerstenberg collection |
Israel | |
| Galuskin et al. (2015) |
| Galuskina et al. (2017) +1 other reference |
| Galuskin et al. (2023) | |
| Galuskin et al. (2016) | |
Italy | |
| Stoppa F. |
Middle East | |
| Gross (1977) | |
Palestine | |
| Seryotkin et al. (2012) |
Poland | |
| Ćukasz Kruszewski PXRD data |
| Cu +2 other references |
USA | |
| Van Nostrand Reinholt Press: 407. +2 other references |
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Lapanouse-de-Sévérac slag locality, Sévérac-d'Aveyron, Rodez, Aveyron, Occitanie, France