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Raudseppite
A valid IMA mineral species
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Formula:
Ba2Ca7(Si3O9)2(CO3)2Cl2
Specific Gravity:
3.31 (Calculated)
Crystal System:
Triclinic
Name:
named for Honorary Professor Dr. Mati Raudsepp (27 March 1947 in Göteborg, Sweden – January 10, 2024 Guelph, ON, Canada) for his invaluable expertise and support of research at UBC in quantitative X-ray powder diffraction for over three decades.
New structure type. Unique combination of elements (at the upload time).
Raudseppite to be the only three-membered cyclosilicate with CO3 groups or Cl.
Raudseppite to be the only three-membered cyclosilicate with CO3 groups or Cl.
Unique Identifiers
Mindat ID:
499350
Long-form identifier:
mindat:1:1:499350:2
IMA Classification of Raudseppite
Approved
Approval year:
2025
Approval history:
IMA No. 2025-070
Type description reference:
Classification of Raudseppite
9.CA.
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 |
|---|---|---|
| Rdp | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Raudseppite
Density:
3.31 g/cm3 (Calculated)
Chemistry of Raudseppite
Mindat Formula:
Ba2Ca7(Si3O9)2(CO3)2Cl2
Element Weights:
Crystallography of Raudseppite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.7818(4) Å, b = 7.8360(4) Å, c = 11.0318(6) Å
α = 100.229(1)°, β = 92.743(1)°, γ = 113.200(1)°
α = 100.229(1)°, β = 92.743(1)°, γ = 113.200(1)°
Ratio:
a:b:c = 0.993 : 1 : 1.408
Unit Cell V:
603.29 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.39 Å | (31) |
| 4.048 Å | (23) |
| 3.618 Å | (22) |
| 3.253 Å | (46) |
| 3.048 Å | (100) |
| 3.029 Å | (62) |
| 2.951 Å | (41) |
| 2.692 Å | (24) |
Type Occurrence of Raudseppite
General Appearance of Type Material:
anhedral, equant to poikiloblastic grains, commonly with inclusions of clinopyroxene
Place of Conservation of Type Material:
the collections of the Canadian Museum of Nature, Natural
Heritage Campus, 1740 Pink Road, Gatineau, Quebec J9J 3N7, Canada, catalogue number CMNMC 93669
Heritage Campus, 1740 Pink Road, Gatineau, Quebec J9J 3N7, Canada, catalogue number CMNMC 93669
Geological Setting of Type Material:
Barium rich skarn
Associated Minerals at Type Locality:
Synonyms of Raudseppite
Other Language Names for Raudseppite
Dutch:Raudseppiet
Related Minerals - Strunz-mindat Grouping
| 9.CA. | 'UM1975-18-SiO:Mn' | α-MnSiO3 |
| 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.20 | Pseudowollastonite | CaSiO3 |
| 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
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 Raudseppite
mindat.org URL:
https://www.mindat.org/min-499350.html
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References for Raudseppite
Reference List:
Localities for Raudseppite
Showing 1 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.
Canada (TL) | |
| Macquistan et al. (2026) |