Manganrockbridgeite
A valid IMA mineral species
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About Manganrockbridgeite
Formula:
Mn2+2Fe3+3(PO4)3(OH)4(H2O)
Colour:
green
Lustre:
Vitreous, Pearly
Specific Gravity:
3.40 (Calculated)
Crystal System:
Monoclinic
Member of:
The Mn analogue of ferrorockbridgeite.
Note: the IMA Newsletter reports the type locality as "76 metre level"; as this could be a typo (there's a "67 m level" sublocality on Mindat), the mineral as added to the main-category listing.
Note: the IMA Newsletter reports the type locality as "76 metre level"; as this could be a typo (there's a "67 m level" sublocality on Mindat), the mineral as added to the main-category listing.
Unique Identifiers
Mindat ID:
470690
Long-form identifier:
mindat:1:1:470690:4
IMA Classification of Manganrockbridgeite
Approved
Approval year:
2023
Approval history:
IMA No. 2022-122
Type description reference:
Grey, Ian E., Hochleitner, Rupert, Kampf, Anthony R., Boer, Stephanie, MacRae, Colin M., Cashion, John D., Rewitzer, Christian, Mumme, William G. (2023) Manganrockbridgeite, Mn2+2Fe3+3(PO4)3(OH)4(H2O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 35 (2) 295-304 doi:10.5194/ejm-35-295-2023
Classification of Manganrockbridgeite
8.BC.
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
C : With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
C : With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
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 |
|---|---|---|
| Mrkb | 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 Manganrockbridgeite
Vitreous, Pearly
Colour:
Green
Streak:
Greyish-green
Cleavage:
Perfect
parallel to {001}
parallel to {001}
Density:
3.40 g/cm3 (Calculated)
Optical Data of Manganrockbridgeite
Type:
Biaxial (+/-)
RI values:
nα = 1.795(5) nβ = 1.805 nγ = 1.815(5)
2V:
Measured: 90° (2)
Max. Birefringence:
δ = 0.020
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.
Pleochroism:
Visible
Comments:
X blue-green, Y yellow-brown, Z light yellow-brown
Chemistry of Manganrockbridgeite
Mindat Formula:
Mn2+2Fe3+3(PO4)3(OH)4(H2O)
Element Weights:
Crystallography of Manganrockbridgeite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 5.198(4) Å, b = 16.905(6) Å, c = 7.510(12) Å
β = 110.02(3)°
β = 110.02(3)°
Ratio:
a:b:c = 0.307 : 1 : 0.444
Unit Cell V:
620.04 ų (Calculated from Unit Cell)
Z:
2
Morphology:
The crystals are elongated on [100] and flattened on {001},
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.880 Å | (61) |
| 4.734 Å | (32) |
| 3.638 Å | (32) |
| 3.458 Å | (71) |
| 3.404 Å | (30) |
| 3.209 Å | (100) |
| 2.435 Å | (70) |
| 1.596 Å | (49) |
Type Occurrence of Manganrockbridgeite
General Appearance of Type Material:
forms compact intergrowths and clusters of shiny greenish black blades up to 200 µm long and 20 µm wide but only a few micrometres thick.
Place of Conservation of Type Material:
collections of the Mineralogical State Collection, Theresienstraße 39, 80333 München, Germany, catalogue number MSM-38033
Geological Setting of Type Material:
pegmatite
Associated Minerals at Type Locality:
Reference:
Grey, Ian E., Hochleitner, Rupert, Kampf, Anthony R., Boer, Stephanie, MacRae, Colin M., Cashion, John D., Rewitzer, Christian, Mumme, William G. (2023) Manganrockbridgeite, Mn2+2Fe3+3(PO4)3(OH)4(H2O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 35 (2) 295-304 doi:10.5194/ejm-35-295-2023
Synonyms of Manganrockbridgeite
Other Language Names for Manganrockbridgeite
Dutch:Manganrockbridgeiet
German:Manganrockbridgeit
Relationship of Manganrockbridgeite to other Species
Member of:
Other Members of Rockbridgeite Group:
| Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) | Orth. mmm(2/m2/m2/m) |
| Ferrorockbridgeite | (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O) | Orth. mmm(2/m2/m2/m) |
| Frondelite | (Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 | Orth. 222 : C2221 |
| Plimerite | ZnFe3+4(PO4)3(OH)5 | Orth. mmm(2/m2/m2/m) |
| Rockbridgeite | (Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 | Orth. mmm(2/m2/m2/m) |
Common Associates
Associations Based on Photo Data:
| 2 photos of Manganrockbridgeite associated with Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 2 photos of Manganrockbridgeite associated with Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O |
| 1 photo of Manganrockbridgeite associated with Kenngottite | Mn2+3Fe3+4(PO4)4(OH)6(H2O)2 |
Related Minerals - Strunz-mindat Grouping
| 8.BC. | Elaliite | (Fe2+8Fe3+)(PO4)O8 |
| 8.BC. | Elkinstantonite | Fe4(PO4)2O |
| 8.BC.05 | Leybovite-K | KCuNa(MgFe3+)(AsO4)3 |
| 8.BC.05 | Angelellite | Fe3+4(AsO4)2O3 |
| 8.BC.10 | Frondelite | (Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Rockbridgeite | (Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Ferrorockbridgeite | (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Plimerite | ZnFe3+4(PO4)3(OH)5 |
| 8.BC.15 | Aerugite | Ni8.5(AsO4)2As5+O8 |
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 Manganrockbridgeite
mindat.org URL:
https://www.mindat.org/min-470690.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 Manganrockbridgeite
Reference List:
Bosi, Ferdinando, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2023) Newsletter 72. Mineralogical Magazine, 87 (3) 512-518 doi:10.1180/mgm.2023.21
Grey, Ian E., Hochleitner, Rupert, Kampf, Anthony R., Boer, Stephanie, MacRae, Colin M., Cashion, John D., Rewitzer, Christian, Mumme, William G. (2023) Manganrockbridgeite, Mn2+2Fe3+3(PO4)3(OH)4(H2O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 35 (2) 295-304 doi:10.5194/ejm-35-295-2023
Localities for Manganrockbridgeite
Showing 2 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.
Brazil | |
| Tvrdý et al. (2024) |
Germany (TL) | |
| Bosi et al. (2023) |
Quick NavTopAbout ManganrockbridgeiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany