Taniajacoite
A valid IMA mineral species
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About Taniajacoite
Tania and Jaco Janse van Nieuwenhuizen
Formula:
SrCaMn3+2Si4O11(OH)4 · 2H2O
Colour:
Brown
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.05
Crystal System:
Triclinic
Member of:
Name:
Named after Jaco and Tania Janse van Nieuwenhuizen who found the specimen.
Type Locality:
Isostructural with:
This page provides mineralogical data about Taniajacoite.
Unique Identifiers
Mindat ID:
46550
Long-form identifier:
mindat:1:1:46550:4
IMA Classification of Taniajacoite
Approved
IMA Formula:
SrCaMn3+2Si4O11(OH)4·2H2O
Approval year:
2015
First published:
2021
Type description reference:
Yang, Hexiong, Gu, Xiangping, Cairncross, Bruce, Downs, Robert T., Evans, Stanley H. (2021) Taniajacoite and strontioruizite, two new minerals isostructural with ruizite from the N'Chwaning III Mine, Kalahari Manganese Field, South Africa. The Canadian Mineralogist, 59 (2) 431-444 doi:10.3749/canmin.2000037
Classification of Taniajacoite
9.BJ.35
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. 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 for Standard |
|---|---|---|
| Tjc | 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 Taniajacoite
Vitreous
Transparency:
Transparent
Colour:
Brown
Streak:
Very light brown
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {010}
Good on {010}
Parting:
None
Density:
3.05(2) g/cm3 (Measured) 3.09 g/cm3 (Calculated)
Optical Data of Taniajacoite
Type:
Biaxial (-)
RI values:
nα = 1.686(2) nβ = 1.729(2) nγ = 1.746(2)
2V:
Measured: 63.7° (5), Calculated: 62.5°
Max. Birefringence:
δ = 0.060
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.
Chemistry of Taniajacoite
Mindat Formula:
SrCaMn3+2Si4O11(OH)4 · 2H2O
Element Weights:
Crystallography of Taniajacoite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Cell Parameters:
a = 9.1386(5) Å, b = 6.2566(3) Å, c = 12.0043(6) Å
α = 90.019(4)°, β = 91.643(4)°, γ = 89.900(4)°
α = 90.019(4)°, β = 91.643(4)°, γ = 89.900(4)°
Ratio:
a:b:c = 1.461 : 1 : 1.919
Unit Cell V:
686.08 ų
Twinning:
No macroscopic twinning.
Comment:
Non-standard space-group setting C1, to allow easier comparison with other, monoclinic (C2) members of the ruizite group. Pseudomonoclinic.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.224 Å | (30) |
| 3.131 Å | (88) |
| 2.980 Å | (63) |
| 2.902 Å | (33) |
| 2.771 Å | (100) |
| 2.541 Å | (31) |
| 2.534 Å | (64) |
| 2.367 Å | (43) |
Reference:
Yang, Hexiong, Gu, Xiangping, Cairncross, Bruce, Downs, Robert T., Evans, Stanley H. (2021) Taniajacoite and strontioruizite, two new minerals isostructural with ruizite from the N'Chwaning III Mine, Kalahari Manganese Field, South Africa. The Canadian Mineralogist, 59 (2) 431-444 doi:10.3749/canmin.2000037
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Taniajacoite
General Appearance of Type Material:
Radiating acicular brown crystals.
Place of Conservation of Type Material:
Co-type material is deposited in the collections of the Mineral Museum of the University of Arizona, Tucson, AZ, USA, catalogue number 20009, and the RRUFF Project, deposition number R140945
Associated Minerals at Type Locality:
Reference:
Yang, Hexiong, Gu, Xiangping, Cairncross, Bruce, Downs, Robert T., Evans, Stanley H. (2021) Taniajacoite and strontioruizite, two new minerals isostructural with ruizite from the N'Chwaning III Mine, Kalahari Manganese Field, South Africa. The Canadian Mineralogist, 59 (2) 431-444 doi:10.3749/canmin.2000037
Synonyms of Taniajacoite
Other Language Names for Taniajacoite
Dutch:Taniajacoiet
German:Taniajacoit
Relationship of Taniajacoite to other Species
Member of:
Other Members of Ruizite Group:
| Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O | Mon. 2 |
| Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O | Mon. 2 : B2 |
Common Associates
Associations Based on Photo Data:
| 2 photos of Taniajacoite associated with Pectolite | NaCa2Si3O8(OH) |
| 2 photos of Taniajacoite associated with Namansilite | NaMn3+Si2O6 |
| 2 photos of Taniajacoite associated with 'Braunite-II' | Ca(Mn3+,Fe)14(SiO4)O20 |
| 2 photos of Taniajacoite associated with Hematite | Fe2O3 |
| 2 photos of Taniajacoite associated with Norrishite | KLiMn3+2(Si4O10)O2 |
| 2 photos of Taniajacoite associated with Sugilite | KNa2Fe3+2Li3[Si12O30] |
Related Minerals - Strunz-mindat Grouping
| 9.BJ. | Arsenmedaite | Mn2+6 As5+Si5O18(OH) |
| 9.BJ.05 | Orientite | Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O |
| 9.BJ.10 | Rosenhahnite | HCa3[Si3O9(OH)] |
| 9.BJ.15 | Trabzonite | Ca4(Si3O9)(OH)2 |
| 9.BJ.20 | Thalénite-(Y) | Y3Si3O10F |
| 9.BJ.25 | Tiragalloite | Mn2+4As5+Si3O12(OH) |
| 9.BJ.30 | Medaite | Mn2+6V5+Si5O18(OH) |
| 9.BJ.35 | Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O |
| 9.BJ.35 | Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O |
| 9.BJ.40 | Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.40 | Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.40 | Alpeite | Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 |
| 9.BJ.40 | Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.45 | Kilchoanite | Ca6(SiO4)(Si3O10) |
| 9.BJ.50 | Prismatine | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 |
| 9.BJ.50 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) |
| 9.BJ.55 | Zunyite | Al13Si5O20(OH,F)18Cl |
| 9.BJ.60 | Hubeite | Ca2Mn2+Fe3+Si4O12(OH) · 2H2O |
| 9.BJ.65 | Cassagnaite | (Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8 |
| 9.BJ.70 | Pavlovskyite | Ca8(SiO4)2(Si3O10) |
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 Taniajacoite
mindat.org URL:
https://www.mindat.org/min-46550.html
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Please feel free to link to this page.
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References for Taniajacoite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 25. Mineralogical Magazine, 79 (3) 529-535 doi:10.1180/minmag.2015.079.3.02
Yang, Hexiong, Gu, Xiangping, Cairncross, Bruce, Downs, Robert T., Evans, Stanley H. (2021) Taniajacoite and strontioruizite, two new minerals isostructural with ruizite from the N'Chwaning III Mine, Kalahari Manganese Field, South Africa. The Canadian Mineralogist, 59 (2) 431-444 doi:10.3749/canmin.2000037
Localities for Taniajacoite
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.
South Africa (TL) | |
| Hålenius et al. (2015) +2 other references |
Quick NavTopAbout TaniajacoiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
N'Chwaning III Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa