Tancaite-(Ce)
A valid IMA mineral species
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About Tancaite-(Ce)
Su Seinargiu, Sarroch, Cagliari
Punta de Su Seinargiu, Sarroch, Metropolitan City of Cagliari, Sardinia, Italy
Punta de Su Seinargiu, Sarroch, Metropolitan City of Cagliari, Sardinia, Italy
Formula:
FeCe(MoO4)3 · 3H2O
Colour:
Red or pale brown
Lustre:
Adamantine, Vitreous
Hardness:
4 - 4½
Specific Gravity:
3.834 (Calculated)
Crystal System:
Trigonal
Name:
Named after Giuseppe Tanca (b. 1943), mineral collector. He discovered the mineral and provided it for study.
This page provides mineralogical data about Tancaite-(Ce).
Unique Identifiers
Mindat ID:
40045
Long-form identifier:
mindat:1:1:40045:5
Similar Names
| Tancoite | A valid IMA mineral species | LiNa2Al(PO4)(PO3OH)(OH) |
| Tanguéite | A synonym of Tangeite | |
| Tankite (of Haidinger) | A synonym of Xenotime-(Y) | |
| Tinguaite | A rock subtype |
IMA Classification of Tancaite-(Ce)
Classification of Tancaite-(Ce)
7.GB.50
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
49.2.5.
49 : HYDRATED MOLYBDATES AND TUNGSTATES
2 : Hydrated Normal Molybdates and Tungstates
49 : HYDRATED MOLYBDATES AND TUNGSTATES
2 : Hydrated Normal Molybdates and Tungstates
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 |
|---|---|---|
| Tca-Ce | 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 Tancaite-(Ce)
Adamantine, Vitreous
Transparency:
Transparent
Colour:
Red or pale brown
Streak:
Yellow
Hardness:
4 - 4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
3.834 g/cm3 (Calculated)
Chemistry of Tancaite-(Ce)
Mindat Formula:
FeCe(MoO4)3 · 3H2O
Element Weights:
Crystallography of Tancaite-(Ce)
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 19.290(1) Å, c = 47.251(5) Å
Ratio:
a:c = 1 : 2.45
Unit Cell V:
15,226.71 ų (Calculated from Unit Cell)
Morphology:
Octahedra truncated by cubes.
Twinning:
Twinning at a small scale is probable. Not observed macroscopically.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.84 Å | (45) |
| 4.12 Å | (8) |
| 3.93 Å | (75) |
| 3.42 Å | (100) |
| 2.785 Å | (10) |
| 1.825 Å | (15) |
| 1.610 Å | (10) |
| 1.340 Å | (12) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Tancaite-(Ce)
General Appearance of Type Material:
Small truncated octahedra up to 0.2 mm in size.
Place of Conservation of Type Material:
Natural History Museum, University of Pisa, Italy, catalogue no. 18911.
Geological Setting of Type Material:
Oxidation zone of a sulfide ore vein, in a quartz vein cutting granite.
Associated Minerals at Type Locality:
Synonyms of Tancaite-(Ce)
Other Language Names for Tancaite-(Ce)
Dutch:Tancaiet-(Ce)
German:Tancait-(Ce)
Common Associates
Associations Based on Photo Data:
| 2 photos of Tancaite-(Ce) associated with Mendozavilite Group | |
| 1 photo of Tancaite-(Ce) associated with Quartz | SiO2 |
| 1 photo of Tancaite-(Ce) associated with Molybdenite | MoS2 |
Related Minerals - Strunz-mindat Grouping
| 7.GB. | Stunorthropite | (NH4)4[Mo2O6(MoO4)2] |
| 7.GB. | Hartkoppeite | Ca4Mn2+Mo6+6As5+4O32(OH)2(H2O)14 · 5H2O |
| 7.GB. | Wangpuite | K3(PO4)(Mo12O36) |
| 7.GB. | Alexearlite | Hg3S2(MoO4) |
| 7.GB. | Ootannite | Th4+2W6+4O16 · 5H2O |
| 7.GB. | Natromolybdite | Na2MoO4 · 2H2O |
| 7.GB. | Marsaalamite-(Y) | Y(MoO4)(OH) |
| 7.GB.05 | Lindgrenite | Cu3(MoO4)2(OH)2 |
| 7.GB.10 | Szenicsite | Cu3(MoO4)(OH)4 |
| 7.GB.15 | 'UM1999-38-WO:CrV' | (V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3] |
| 7.GB.15 | Huenite | Cu4(MoO4)3(OH)2 |
| 7.GB.15 | Cuprotungstite | Cu2(WO4)(OH)2 |
| 7.GB.20 | Phyllotungstite | (H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K) |
| 7.GB.25 | Rankachite | Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O |
| 7.GB.30 | Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| 7.GB.35 | Mpororoite | WAlO3(OH)3 · 2(H2O) |
| 7.GB.35 | Anthoinite | AlWO3(OH)3 |
| 7.GB.40 | Obradovicite-KCu | [K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] |
| 7.GB.45 | Paramendozavilite | [KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13] |
| 7.GB.45 | Mendozavilite-NaFe | [Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2] |
| 7.GB.45 | Obradovicite-NaCu | Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] |
| 7.GB.45 | Obradovicite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] |
| 7.GB.50 | Mendozavilite-NaCu | [Na2(H2O)15Cu(H2O)6][Mo8P2Fe3+3O34(OH)3] |
| 7.GB.50 | Mendozavilite-KCa | [K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3] |
| 7.GB.60 | Peterandresenite | Mn4Nb6O19 · 14H2O |
| 7.GB.60 | Hansesmarkite | Ca2Mn2Nb6O19 · 20H2O |
| 7.GB.60 | Melcherite | Ba2Na2Mg[Nb6O19] · 6H2O |
| 7.GB.65 | Ichnusaite | Th(MoO4)2 · 3H2O |
| 7.GB.70 | Markascherite | Cu3(MoO4)(OH)4 |
| 7.GB.75 | Nuragheite | Th(MoO4)2 · H2O |
| 7.GB.80 | Ophirite | Ca2Mg4[Zn2Mn3+2(H2O)2(Fe3+W9O34)2] · 46H2O |
Fluorescence of Tancaite-(Ce)
Not fluorescent.
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 Tancaite-(Ce)
mindat.org URL:
https://www.mindat.org/min-40045.html
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References for Tancaite-(Ce)
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. (2010) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 2. Mineralogical Magazine, 74 (2) 375-377 doi:10.1180/s0026461x00056036
Localities for Tancaite-(Ce)
Showing 3 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.
Australia | |
| John Haupt collection +1 other reference |
Italy (TL) | |
| Fernando Caboni et al. (2023) +3 other references |
Norway | |
| Husdal (2020) |
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Punta de Su Seinargiu, Sarroch, Metropolitan City of Cagliari, Sardinia, Italy