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Telluromandarinoite
A valid IMA mineral species
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About Telluromandarinoite
Joseph Anthony Mandarino
Formula:
Fe3+2Te3O9 · 6H2O
Colour:
Pale green
Lustre:
Vitreous
Specific Gravity:
3.372 (Calculated)
Crystal System:
Monoclinic
Name:
Tellurium analogue of mandarinoite.
Te analogue of mandarinoite.
This series lies from mandarinoite with the ideal composition Fe2Se3O9·5—6H2O (literature data) to telluromandarinoite with 0.19 apfu Se, i. e., it is almost complete. This is the only natural example of wide isomorphism between selenites and tellurites. Members of this series with compositions in the range of at least Fe2Se3O9·5—6H2O to Fe2(Te2.2Se0.8)O9·6H2O are isostructural. The distribution of Se and Te between the three crystallographically independent B sites in their structure is regular: the B1 site has the strongest affinity for Te, B2 for Se, and B3 is intermediate in this aspect.
This series lies from mandarinoite with the ideal composition Fe2Se3O9·5—6H2O (literature data) to telluromandarinoite with 0.19 apfu Se, i. e., it is almost complete. This is the only natural example of wide isomorphism between selenites and tellurites. Members of this series with compositions in the range of at least Fe2Se3O9·5—6H2O to Fe2(Te2.2Se0.8)O9·6H2O are isostructural. The distribution of Se and Te between the three crystallographically independent B sites in their structure is regular: the B1 site has the strongest affinity for Te, B2 for Se, and B3 is intermediate in this aspect.
Unique Identifiers
Mindat ID:
42801
Long-form identifier:
mindat:1:1:42801:7
IMA Classification of Telluromandarinoite
Classification of Telluromandarinoite
4.JM.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
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 |
|---|---|---|
| Tmda | 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 Telluromandarinoite
Vitreous
Transparency:
Translucent
Colour:
Pale green
Streak:
White
Comment:
Crystals too small to determine the Mohs hardness
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Not observed
Fracture:
Irregular/Uneven
Density:
3.372 g/cm3 (Calculated)
Optical Data of Telluromandarinoite
Type:
Biaxial (+)
RI values:
nα = 1.750(3) nβ = 1.807(3) nγ = 1.910(5)
2V:
Calculated: 76.9°
Max. Birefringence:
δ = 0.160
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
not noticed
Pleochroism:
Non-pleochroic
Comments:
optical orientation: Y = b, c ˆ Z = 10° in obtuse β
Chemistry of Telluromandarinoite
Mindat Formula:
Fe3+2Te3O9 · 6H2O
Element Weights:
Elements listed:
Crystallography of Telluromandarinoite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Cell Parameters:
a = 16.9356(5) Å, b = 7.8955(3) Å, c = 10.1678(3) Å
β = 98.006(1)°
β = 98.006(1)°
Ratio:
a:b:c = 2.145 : 1 : 1.288
Unit Cell V:
1346.32 ų
Z:
4
Comment:
Structurally similar to emmonsite
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.431 Å | (44) |
| 7.153 Å | (100) |
| 5.034 Å | (11) |
| 3.575 Å | (41) |
| 3.463 Å | (21) |
| 2.996 Å | (34) |
| 2.826 Å | (19) |
| 2.624 Å | (11) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Telluromandarinoite
General Appearance of Type Material:
Individual platy crystals, 0.2 mm or less, often in aggregates
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Ontario,Canada, catalogue number M56017
Empirical Formula of Type Material:
Fe3+2.03(Te4+1.71Se4+1.27)Σ2.98O9·6H2O
Chemical Analysis of Type Material:
| SeO2 | 22.91 % |
|---|---|
| TeO2 | 44.30 % |
| Fe2O3 | 26.43 % |
| H2O | 17.59 % |
| Total: | 111.23 % |
Geological Setting of Type Material:
Hydrothermal breccias with silicified clasts of dacite tuffs cemented by silica/barite/alunite
Associated Minerals at Type Locality:
Synonyms of Telluromandarinoite
Other Language Names for Telluromandarinoite
Dutch:Telluromandarinoiet
German:Telluromandarinoit
Common Associates
Associations Based on Photo Data:
| 2 photos of Telluromandarinoite associated with Native Gold | Au |
| 1 photo of Telluromandarinoite associated with Jarosite | KFe3+3(SO4)2(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 4.JM. | Wortupaite | MgNi2+2(Te4+O3)3 · 3H2O |
| 4.JM. | Rudolfhermannite | Fe3+2(Te4+O3)3(H2O) |
| 4.JM.05 | Zemannite | Mg0.5ZnFe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Kinichilite | Mg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2O |
| 4.JM.05 | Ilirneyite | Mg0.5ZnMn3+(Te4+O3)3 · 4.5H2O |
| 4.JM.10 | Emmonsite | Fe3+2(TeO3)3 · 2H2O |
| 4.JM.10 | Blakeite | Fe3+2[TeO3]3 (?) |
| 4.JM.15 | Graemite | Cu[TeO3] · H2O |
| 4.JM.20 | Teineite | Cu2+(Te4+O3) · 2H2O |
| 4.JM.25 | Millsite | Cu2+(Te4+O3) · 2H2O |
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 Telluromandarinoite
mindat.org URL:
https://www.mindat.org/min-42801.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Telluromandarinoite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Localities for Telluromandarinoite
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.
Chile (TL) | |
| Williams et al. (2011) +1 other reference |
Russia | |
| Pekov et al. (2026) |
Spain | |
| ... +1 other reference |
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Filón 340, Rodalquilar, Níjar, Almería, Andalusia, Spain