Ferrorhodonite
A valid IMA mineral species
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About Ferrorhodonite
Formula:
CaMn3Fe[Si5O15]
Colour:
Brown-red, pinkish-brown
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.71
Crystal System:
Triclinic
Member of:
Name:
Named for being an analogue of rhodonite with predominant Fe2+ (FERROus iron) at the M4 site of the structure.
Unique Identifiers
Mindat ID:
47916
Long-form identifier:
mindat:1:1:47916:3
IMA Classification of Ferrorhodonite
Approved
IMA Formula:
CaMn2+3Fe2+(Si5O15)
Approval year:
2016
First published:
2017
Type description reference:
Shchipalkina, Nadezhda V., Chukanov, Nikita V., Pekov, Igor V., Aksenov, Sergey M., McCammon, Catherine, Belakovskiy, Dmitry I., Britvin, Sergey N., Koshlyakova, Natalya N., Schäfer, Christof, Scholz, Ricardo, Rastsvetaeva, Ramiza K. (2017) Ferrorhodonite, CaMn3Fe[Si5O15], a new mineral species from Broken Hill, New South Wales, Australia. Physics and Chemistry of Minerals, 44 (5) 323-334 doi:10.1007/s00269-016-0860-3
Classification of Ferrorhodonite
9.DK.
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
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 |
|---|---|---|
| Frdn | 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 Ferrorhodonite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Brown-red, pinkish-brown
Streak:
White
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on (201), good on (021) and (210) (according to optical data; indexed by analogy with rhodonite).
Perfect on (201), good on (021) and (210) (according to optical data; indexed by analogy with rhodonite).
Parting:
Perfect on (111), i.e. along the twinning plane.
Fracture:
Step-Like
Density:
3.71(2) g/cm3 (Measured) 3.701 g/cm3 (Calculated)
Optical Data of Ferrorhodonite
Type:
Biaxial (+)
RI values:
nα = 1.731 nβ = 1.736 nγ = 1.745
2V:
Measured: 80° , Calculated: 74°
Max. Birefringence:
δ = 0.014
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:
r > v, distinct
Pleochroism:
Non-pleochroic
Comments:
The mineral is colourless under the microscope.
Chemistry of Ferrorhodonite
Mindat Formula:
CaMn3Fe[Si5O15]
Element Weights:
Crystallography of Ferrorhodonite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.6766 Å, b = 7.6754 Å, c = 11.8032 Å
α = 105.501°, β = 92.275°, γ = 93.919°
α = 105.501°, β = 92.275°, γ = 93.919°
Ratio:
a:b:c = 0.87 : 1 : 1.538
Unit Cell V:
580.44 ų
Z:
1
Morphology:
Well-shaped crystals were not observed, single-crystal grains are thick tabular to short prismatic, with rounded edges.
Twinning:
Microtwinning is observed under the microscope; by analogy with rhodonite it is considered as a twinning on (111).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.770 Å | (100) |
| 2.929 Å | (80) |
| 2.968 Å | (55) |
| 3.132 Å | (37) |
| 2.173 Å | (30) |
| 2.595 Å | (25) |
| 2.652 Å | (24) |
| 2.518 Å | (23) |
| 4.765 Å | (21) |
Comments:
Broken Hill South Mine, New South Wales, Australia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) | |
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Ferrorhodonite
General Appearance of Type Material:
Ferrorhodonite forms granular aggregates composed by thick tabular to short prismatic crystals, with rounded edges,up to 2 cm across.
Place of Conservation of Type Material:
The type specimens (fragments of the holotype) are deposited in the collection of type specimens (Typmineralsammlung), Mineralogisches Museum Hamburg, catalogue number MMHH-004704, and in the collections of the Fersman Mineralogical Museum of the Russia.
Empirical Formula of Type Material:
M5(Ca0.81Mn0.19) M1?3(Mn2.52Fe0.48) M4(Fe2+0.81Mn0.12Mg0.04Zn0.03) [Si5O15]
Associated Minerals at Type Locality:
Reference:
Shchipalkina, Nadezhda V., Chukanov, Nikita V., Pekov, Igor V., Aksenov, Sergey M., McCammon, Catherine, Belakovskiy, Dmitry I., Britvin, Sergey N., Koshlyakova, Natalya N., Schäfer, Christof, Scholz, Ricardo, Rastsvetaeva, Ramiza K. (2017) Ferrorhodonite, CaMn3Fe[Si5O15], a new mineral species from Broken Hill, New South Wales, Australia. Physics and Chemistry of Minerals, 44 (5) 323-334 doi:10.1007/s00269-016-0860-3
Synonyms of Ferrorhodonite
Other Language Names for Ferrorhodonite
Dutch:Ferrorhodoniet
German:Ferrorhodonit
Relationship of Ferrorhodonite to other Species
Member of:
Other Members of Rhodonite Group:
| Fowlerite | (Mn2+,Zn,Ca)SiO3 | |
| Rhodonite | CaMn3Mn[Si5O15] | Tric. 1 |
| Vittinkiite | MnMn3Mn[Si5O15] | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 10 photos of Ferrorhodonite associated with 'Zinc-bearing Magnetite' | (Fe,Zn)Fe3O4 |
| 8 photos of Ferrorhodonite associated with Calcite | CaCO3 |
| 4 photos of Ferrorhodonite associated with Willemite | Zn2SiO4 |
| 3 photos of Ferrorhodonite associated with Franklinite | Zn2+Fe3+2O4 |
| 3 photos of Ferrorhodonite associated with Galena | PbS |
Related Minerals - Strunz-mindat Grouping
| 9.DK. | Vittinkiite | MnMn3Mn[Si5O15] |
| 9.DK. | Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 |
| 9.DK. | Shijiangshanite | Pb3CaAl(Si5O14)(OH)3 · 3H2O |
| 9.DK.05 | Nambulite | LiMn2+4Si5O14(OH) |
| 9.DK.05 | Marsturite | NaCaMn3Si5O14(OH) |
| 9.DK.05 | Natronambulite | (Na,Li)(Mn,Ca)4Si5O14OH |
| 9.DK.05 | Rhodonite | CaMn3Mn[Si5O15] |
| 9.DK.05 | Scandiobabingtonite | (Ca,Na)2(Fe2+,Mn)(Sc,Fe3+)Si5O14(OH) |
| 9.DK.05 | Lithiomarsturite | LiCaMn3Si5O14(OH) |
| 9.DK.05 | Manganbabingtonite | Ca2Mn2+Fe3+Si5O14(OH) |
| 9.DK.05 | Fowlerite | (Mn2+,Zn,Ca)SiO3 |
| 9.DK.05 | Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| 9.DK.10 | Santaclaraite | CaMn4[Si5O14OH](OH) · H2O |
| 9.DK.15 | Saneroite | NaMn2+5[Si5O14(OH)](VO3)(OH) |
| 9.DK.20 | Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 |
| 9.DK.20 | Tadzhikite-(Ce) | Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2 |
| 9.DK.20 | 'Hellandite-(Yb)' | (Ca,Y)4(Yb,Y)2(Al,Fe3+,Ti4+)(Be,Li)2[B4Si4O22](O,F,OH)2 |
| 9.DK.20 | Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 |
| 9.DK.20 | Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 |
| 9.DK.20 | Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
| 9.DK.20 | Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
Fluorescence of Ferrorhodonite
Not fluorescent.
Other Information
IR Spectrum:
The IR spectrum is very close to that of Fe-poor rhodonite. Bands of OH groups (in the range 3000–4000 cm−1) are absent.
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 Ferrorhodonite
mindat.org URL:
https://www.mindat.org/min-47916.html
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Please feel free to link to this page.
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References for Ferrorhodonite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter 32. Mineralogical Magazine, 80 (5) 915-922 doi:10.1180/minmag.2016.080.084
Shchipalkina, Nadezhda V., Chukanov, Nikita V., Pekov, Igor V., Aksenov, Sergey M., McCammon, Catherine, Belakovskiy, Dmitry I., Britvin, Sergey N., Koshlyakova, Natalya N., Schäfer, Christof, Scholz, Ricardo, Rastsvetaeva, Ramiza K. (2017) Ferrorhodonite, CaMn3Fe[Si5O15], a new mineral species from Broken Hill, New South Wales, Australia. Physics and Chemistry of Minerals, 44 (5) 323-334 doi:10.1007/s00269-016-0860-3
Localities for Ferrorhodonite
Showing 6 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 (TL) | |
| Hålenius et al. (2016) +2 other references |
Germany | |
| in the collection of Christof Schäfer |
Romania | |
| Paulina Hirtopanu et al. (2018) |
Slovakia | |
| Myšľan Pavol; Števko Martin; Mikuš Tomáš (2024) |
Sweden | |
| Pavel M. Kartashov analytical data 2021 |
USA | |
| King (n.d.) |
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Broken Hill South Mine, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia