Silesiaite
A valid IMA mineral species
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About Silesiaite
Formula:
Ca4Fe3+2Sn2(Si2O7)2(Si2O6OH)2
Formula according to CNMNC Newsletter 70, establishment of kristansenite group.
Colour:
Colourless to rarely greenish-grey
Hardness:
6
Specific Gravity:
3.737 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
For Silesia, Latin name of Śląsk, which is a large area occupying >50% of the southern (south-west and south) part of Poland, and where the type locality is situated.
Type Locality:
Isostructural with:
The Fe(III)-analogue of kristiansenite. The Fe3+Sn-analogue of kozłowskiite. Chemically similar to toturite.
The content of some of the M sites is somewhat variable:
* M1 = Fe3+ + Sc (mainly), the M2-M4 sites: Sn (Szklarska Poręba material), versus
* M1-M3: Sn-dominant, M4: Fe3+-dominant (Häiviäntien material).
The content of some of the M sites is somewhat variable:
* M1 = Fe3+ + Sc (mainly), the M2-M4 sites: Sn (Szklarska Poręba material), versus
* M1-M3: Sn-dominant, M4: Fe3+-dominant (Häiviäntien material).
Unique Identifiers
Mindat ID:
52572
Long-form identifier:
mindat:1:1:52572:7
GUID
(UUID V4):
(UUID V4):
0f6026ac-f0f8-4c85-a74d-c41a3a86310c
IMA Classification of Silesiaite
Classification of Silesiaite
9.BC.30
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
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 |
---|---|---|
Ssa | 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 Silesiaite
Transparency:
Transparent
Colour:
Colourless to rarely greenish-grey
Hardness:
6 on Mohs scale
Density:
3.737 g/cm3 (Calculated)
Optical Data of Silesiaite
Type:
Biaxial
Dispersion:
High
Pleochroism:
Visible
Comments:
Under plane polarized light, the crystals are uncoloured to yellowish.
The refractive index is between 1.887 (hydroandradite) and 1.55 (Canada balsam).
mean refractive index of ~1.727 calculated from the Gladstone-Dale relation
The refractive index is between 1.887 (hydroandradite) and 1.55 (Canada balsam).
mean refractive index of ~1.727 calculated from the Gladstone-Dale relation
Chemistry of Silesiaite
Mindat Formula:
Ca4Fe3+2Sn2(Si2O7)2(Si2O6OH)2
Formula according to CNMNC Newsletter 70, establishment of kristansenite group.
Formula according to CNMNC Newsletter 70, establishment of kristansenite group.
Chemical Analysis
Empirical formulas:
Sample ID | Empirical Formula |
---|---|
2 | Ca2.001(2[(Sn1.105Zr0.009)?1.114(Fe3+0.523Sc0.185Al0.070)?0.779(Fe2+0.065Mn2+0.041Mg0.003)?0.110]?2.003(Si3.997O13OH) |
3 | Ca2.006[(Sn1.110(Ti0.006)?1.107(Fe3+0.648Al0.063)?0.710(Fe2+0.140Mn2+0.011Mg0.005)?0.155(Nb0.020Ta0.011)?0.040]?2.009(Si3.991O13OH) |
Sample references:
ID | Locality | Reference | Notes |
---|---|---|---|
2 | Szklarska Poręba Huta granite quarry, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland | EPMA, 13 O2– + 1 (OH)–anions normalization | |
3 | Häiviäntien pegmatite, Forssa, Kanta-Häme, Finland | " " |
Crystallography of Silesiaite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Cell Parameters:
a = 10;.028(1) Å, b = 8.408(1) Å, c = 13.339(2) Å
α = 90.01(1)°, β = 109.10(1)°, γ = 90.00(1)°
α = 90.01(1)°, β = 109.10(1)°, γ = 90.00(1)°
Ratio:
a:b:c = 1.189 : 1 : 1.586
Unit Cell V:
1,059.80 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Polysynthetic twinning.
Comment:
Space group is C1
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.147 Å | (100) |
8.408 Å | (12) |
6.607 Å | (64) |
5.195 Å | (6) |
4.413 Å | (10) |
3.312 Å | (7) |
3.151 Å | (12) |
3.095 Å | (9) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Silesiaite
General Appearance of Type Material:
Mixed kristiansenite-silesiaite crystals with maximum sizes of ~350 × 100 μm. Silesiaite occurs in the form of Fe-dominant bands, usually reaching only a few micrometers in thickness.
Place of Conservation of Type Material:
Collections of the Mineralogical Museum, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland, catalogue number MMWr IV7929.
Geological Setting of Type Material:
Granitic pegmatite.
Associated Minerals at Type Locality:
Synonyms of Silesiaite
Relationship of Silesiaite to other Species
Member of:
Other Members of this group:
Kozłowskiite | Ca4Fe2+2Sn3(Si2O7)2(Si2O6OH)2 | Tric. 1 |
Kristiansenite | Ca4Sc2Sn2(Si2O7)2(Si2O6OH)2 | Tric. 1 |
Common Associates
Associated Minerals Based on Photo Data:
2 photos of Silesiaite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
9.BC. | Kozłowskiite | Ca4Fe2+2Sn3(Si2O7)2(Si2O6OH)2 |
9.BC. | Anorthoyttrialite-(Y) | Y4(SiO4)(Si3O10) |
9.BC.05 | Gittinsite | CaZrSi2O7 |
9.BC.05 | Keiviite-(Y) | Y2Si2O7 |
9.BC.05 | Keiviite-(Yb) | Yb2Si2O7 |
9.BC.05 | Thortveitite | Sc2Si2O7 |
9.BC.05 | Yttrialite-(Y) | (Y,Th)2Si2O7 |
9.BC.10 | Keldyshite | (Na,H)2ZrSi2O7 |
9.BC.10 | Khibinskite | K2ZrSi2O7 |
9.BC.10 | Parakeldyshite | Na2ZrSi2O7 |
9.BC.15 | Rankinite | Ca3Si2O7 |
9.BC.20 | Barysilite | Pb8Mn2+[Si2O7]3 |
9.BC.25 | Edgarbaileyite | [Hg2]2+3[Si2O7] |
9.BC.30 | Kristiansenite | Ca4Sc2Sn2(Si2O7)2(Si2O6OH)2 |
9.BC.35 | Percleveite-(Ce) | Ce2Si2O7 |
9.BC.35 | Percleveite-(La) | La2Si2O7 |
9.BC.40 | Scottyite | BaCu2Si2O7 |
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 Silesiaite
mindat.org URL:
https://www.mindat.org/min-52572.html
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References for Silesiaite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 40. Mineralogical Magazine, 81 (6) 1577-1581 doi:10.1180/minmag.2017.081.096
Cepedal, Antonia, Fuertes-Fuente, Mercedes, Martin-Izard, Agustín (2021) Occurrence of silesiaite, a new calcium–iron–tin sorosilicate in the calcic skarn of El Valle-Boinás, Asturias, Spain. European Journal of Mineralogy, 33 (2) 165-174 doi:10.5194/ejm-33-165-2021
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 70. European Journal of Mineralogy, 34 (6) 591-601 doi:10.5194/ejm-34-591-2022
Pieczka, Adam, Zelek-Pogudz, Sylwia, Gołębiowska, Bożena, Stadnicka, Katarzyna M., Kristiansen, Roy (2023) Silesiaite, ideally Ca2Fe3+Sn(Si2O7)(Si2O6OH), a new species in the kristiansenite group: crystal chemistry and structure of holotype silesiaite from Szklarska Poręba, Poland, and Sc-free silesiaite from Häiviäntien, Finland. Mineralogical Magazine, 87 (2) 271-283 doi:10.1180/mgm.2023.5
Localities for Silesiaite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Finland | |
| Kristiansen (2023) |
Poland (TL) | |
| Mineralogical Magazine +3 other references |
Spain | |
| Cepedal et al. (2021) |
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Boinás west skarn, El Valle-Boinás Mine, Belmonte de Miranda, Asturias, Spain