Wollastonite-1A
A structural variant of Wollastonite
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About Wollastonite-1A
William Hyde Wollaston
Formula:
CaSiO3
Colour:
white
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.922
Crystal System:
Triclinic
Name:
Named in honour of William Hyde Wollaston (6 August 1766, East Dereham, Norfolk, England, UK - 22 December 1828, London, England, UK), English chemist and mineralogist who discovered palladium (1804) and rhodium (1809) and invented the reflecting goniometer (1809) and the camera lucida (1812).
A polytype of Wollastonite
Originally described from Dognecea (Dognaczka; Dognacska), Banat, Caras-Severin Co., Romania.
Originally described from Dognecea (Dognaczka; Dognacska), Banat, Caras-Severin Co., Romania.
Unique Identifiers
Mindat ID:
7369
Long-form identifier:
mindat:1:1:7369:7
Similar Names
| Wollastonite-3T | A synonym of 'Wollastonite-3A' | Ca3(Si3O9) |
| Wollastonite-4T | A synonym of 'Wollastonite-4A' | Ca3(Si3O9) |
| Wollastonite-5T | A synonym of 'Wollastonite-5A' | Ca3(Si3O9) |
| Wollastonite-7T | A synonym of 'Wollastonite-7A' | CaSiO3 |
Classification of Wollastonite-1A
9.DG.05
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
65.2.1.1a
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
2 : Single-Width Unbranched Chains, W=1 with chains P=3
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
2 : Single-Width Unbranched Chains, W=1 with chains P=3
Physical Properties of Wollastonite-1A
Vitreous
Colour:
White
Hardness:
5 on Mohs scale
Cleavage:
Very Good
The perfect cleavage on {100} can be easily observed, as well as the good cleavages on {001} and {102}.
The perfect cleavage on {100} can be easily observed, as well as the good cleavages on {001} and {102}.
Density:
2.922(2) g/cm3 (Measured) 2.916 g/cm3 (Calculated)
Optical Data of Wollastonite-1A
Type:
Biaxial (-)
RI values:
nα = 1.615 - 1.646 nβ = 1.627 - 1.659 nγ = 1.629 - 1.662
2V:
Measured: 40° , Calculated: 44° to 50°
Max. Birefringence:
δ = 0.014 - 0.016
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r > v distinct
Chemistry of Wollastonite-1A
Mindat Formula:
CaSiO3
Element Weights:
Elements listed:
Crystallography of Wollastonite-1A
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.9233(3) Å, b = 7.3203(3) Å, c = 7.0651(3) Å
α = 90.053°, β = 95.208(3)°, γ = 103.384(3)°
α = 90.053°, β = 95.208(3)°, γ = 103.384(3)°
Ratio:
a:b:c = 1.082 : 1 : 0.965
Unit Cell V:
396.91 ų (Calculated from Unit Cell)
Z:
6
Morphology:
radial or sheaf-like aggregates composed of individual crystals up to 30 mm long and 1 mm wide. Individual crystals are elongated along the [010] axis.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.314 Å | (100) |
| 3.83 Å | (84) |
| 3.51 Å | (77) |
| 3.086 Å | (58) |
| 2.302 Å | (52) |
| 2.556 Å | (44) |
| 1.759 Å | (35) |
Reference:
Synonyms of Wollastonite-1A
Other Language Names for Wollastonite-1A
German:Wollastonit-1A
Russian:Волластонит-1T
Common Associates
Associations Based on Photo Data:
| 1 photo of Wollastonite-1A associated with Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
Related Minerals - Strunz-mindat Grouping
| 9.DG. | Barrydawsonite-(Y) | Na1.5Y0.5CaSi3O8(OH) |
| 9.DG. | Paratobermorite | Ca5AlSi5O16(OH) · 5H2O |
| 9.DG. | Calcinaksite | KNaCa(Si4O10) · H2O |
| 9.DG. | Alvesite | NaKZrSi6O15 · 2H2O |
| 9.DG.02 | Steedeite | NaMn2[Si3BO9](OH)2 |
| 9.DG.02 | Nolzeite | NaMn2[Si3BO9](OH)2 · 2H2O |
| 9.DG.05 | Murakamiite | LiCa2Si3O8(OH) |
| 9.DG.05 | Serandite | NaMn2+2Si3O8(OH) |
| 9.DG.05 | Bustamite | CaMn2+(Si2O6) |
| 9.DG.05 | Pectolite | NaCa2Si3O8(OH) |
| 9.DG.05 | Tanohataite | LiMn2Si3O8(OH) |
| 9.DG.05 | Dalnegorskite | Ca5Mn(Si3O9)2 |
| 9.DG.05 | Wollastonite | Ca3(Si3O9) |
| 9.DG.05 | Ferrobustamite | CaFe2+(Si2O6) |
| 9.DG.05 | Schizolite | NaCaMnSi3O8(OH) |
| 9.DG.07 | Cascandite | CaScSi3O8(OH) |
| 9.DG.08 | Plombièrite | Ca5Si6O16(OH)2 · 7H2O |
| 9.DG.10 | Clinotobermorite | Ca5Si6O17 · 5H2O |
| 9.DG.10 | Riversideite | Ca5Si6O16(OH)2 · 2H2O |
| 9.DG.10 | Tobermorite | Ca5Si6O17 · 5H2O |
| 9.DG.12 | Jusite | Na2Ca15Al4Si16O54 · 17H2O |
| 9.DG.12 | Kenotobermorite | Ca4Si6O15(OH)2 · 5H2O |
| 9.DG.15 | Foshagite | Ca4(Si3O9)(OH)2 |
| 9.DG.20 | Jennite | Ca9(Si3O9)2(OH)8 · 8H2O |
| 9.DG.20 | Kamenevite | K2TiSi3O9 · H2O |
| 9.DG.25 | Paraumbite | K3Zr2H(Si3O9)2 · nH2O |
| 9.DG.25 | Umbite | K2(Zr,Ti)Si3O9 · H2O |
| 9.DG.30 | Sørensenite | Na4SnBe2Si6O16(OH)4 |
| 9.DG.32 | Escheite | Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2O |
| 9.DG.35 | Xonotlite | Ca6(Si6O17)(OH)2 |
| 9.DG.40 | Hillebrandite | Ca2(SiO3)(OH)2 |
| 9.DG.45 | Zorite | Na8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O |
| 9.DG.45 | Chivruaiite | Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O |
| 9.DG.50 | Haineaultite | (Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O |
| 9.DG.55 | Epididymite | Na2Be2Si6O15 · H2O |
| 9.DG.60 | Eudidymite | Na2Be2Si6O15 · H2O |
| 9.DG.65 | Elpidite | Na2ZrSi6O15 · 3H2O |
| 9.DG.65 | Patynite | NaKCa4[Si9O23] |
| 9.DG.67 | Whelanite | Cu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2O |
| 9.DG.70 | Enricofrancoite | KNaCaSi4O10 |
| 9.DG.70 | Yusupovite | Na2Zr(Si6O15) · 2.5H2O |
| 9.DG.70 | Litidionite | KNaCuSi4O10 |
| 9.DG.70 | Fenaksite | (K,Na)4(Fe,Mn)2(Si4O10)2(OH,F) |
| 9.DG.70 | Manaksite | KNaMnSi4O10 |
| 9.DG.75 | Senkevichite | CsKNaCa2TiO[Si7O18](OH) |
| 9.DG.75 | Tinaksite | K2Na(Ca,Mn2+)2TiO[Si7O18(OH)] |
| 9.DG.75 | Tokkoite | K2Ca4[Si7O18(OH)](OH,F) |
| 9.DG.80 | Fluorcanasite | K3Na3Ca5Si12O30F4 · H2O |
| 9.DG.80 | Canasite | K3Na3Ca5Si12O30(OH)4 |
| 9.DG.85 | Miserite | K1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O |
| 9.DG.90 | Frankamenite | K3Na3Ca5(Si12O30)(F,OH)4 · H2O |
| 9.DG.92 | Charoite | (K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O |
| 9.DG.95 | Yuksporite | K4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3 |
| 9.DG.97 | Eveslogite | (Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14 |
Fluorescence of Wollastonite-1A
The mineral is slightly luminescent under long-wave (366 nm) ultraviolet radiation, the luminescence tint being light blue. The powders show a strong cathodoluminescence in blue tints, which is also evident on some thin sections and associates with the bright green cathodoluminescence color reported previously
Other Information
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 Wollastonite-1A
mindat.org URL:
https://www.mindat.org/min-7369.html
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Please feel free to link to this page.
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References for Wollastonite-1A
Reference List:
Localities for Wollastonite-1A
Showing 10 localities.
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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.
Italy | |
| King (n.d.) +1 other reference |
Japan | |
| Henmi et al. (1983) |
| Handbook of Mineralogy. |
Mexico | |
| Brenker et al. (2002) |
Romania | |
| Marincea et al. (2026) |
| Klaproth (1802) |
Russia | |
| Zhitova et al. (2025) |
USA | |
| PXRD by John Attard (Attard XRD Services, San Diego) |
| University of Arizona Mineral Museum ... |
| [micromounts@yahoogroups.com] |
In-Ko-Pah Gorge, Boulder Park, Imperial County, California, USA