Thionasilite
A valid IMA mineral species - pending publication
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Formula:
Na2Si2S2O3
Crystal System:
Orthorhombic
Name:
Named after its (somewhat unique) composition, "thio" meaning sulfur.
Type Locality:
Structurally related to hydroxyapophyllite-(K).
Note: If the formula given is correct, either the silicon in this mineral is zerovalent (rather unlikely) or, rather, the mineral has a Si2O52- anion with 2 oxygen atoms substituted by sulfide.
Note: If the formula given is correct, either the silicon in this mineral is zerovalent (rather unlikely) or, rather, the mineral has a Si2O52- anion with 2 oxygen atoms substituted by sulfide.
Unique Identifiers
Mindat ID:
488779
Long-form identifier:
mindat:1:1:488779:5
IMA Classification of Thionasilite
Approved, Pending publication
Approval history:
IMA No. 2025-021
Classification of Thionasilite
2.MA.20
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
M : Oxysulfosalts
A : Oxysulfosalts of Alkalies and Alkali Earths
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
M : Oxysulfosalts
A : Oxysulfosalts of Alkalies and Alkali Earths
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 |
|---|---|---|
| Thio | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Chemistry of Thionasilite
Mindat Formula:
Na2Si2S2O3
Element Weights:
Elements listed:
Crystallography of Thionasilite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Aba2
Cell Parameters:
a = 8.7952(4) Å, b = 8.7897(3) Å, c = 16.0084(7) Å
Ratio:
a:b:c = 1.001 : 1 : 1.821
Unit Cell V:
1,237.56 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.00 Å | (27) |
| 3.854 Å | (5) |
| 3.166 Å | (5) |
| 3.109 Å | (100) |
| 2.805 Å | (5) |
| 2.668 Å | (13) |
| 2.199 Å | (7) |
| 2.025 Å | (12) |
Type Occurrence of Thionasilite
Place of Conservation of Type Material:
the collections of the Naturhistorisches Museum Bern, Bernastrasse 15, 3005 Bern, Switzerland, catalogue number NMBE-54013
Other Language Names for Thionasilite
Dutch:Thionasiliet
Related Minerals - Strunz-mindat Grouping
| 2.MA.05 | Ottensite | (Na,K)3Sb3+6(Sb3+S3)O9 · 3H2O |
| 2.MA.05 | Cetineite | (K,Na)6Sb3+12(Sb3+S3)2O18(OH)0.5 · 5,5H2O |
| 2.MA.10 | Sarabauite | CaSb3+10S6O10 |
| 2.MA.15 | Cafeosite | Ca4Fe2+3Fe3+2◻O6S4 |
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 Thionasilite
mindat.org URL:
https://www.mindat.org/min-488779.html
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References for Thionasilite
Localities for Thionasilite
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.
Oman (TL) | |
| Zappatini et al. (2025) |
