Ferrorockbridgeite
A valid IMA mineral species
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About Ferrorockbridgeite
Formula:
(Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O)
Colour:
Dark green to black.
Specific Gravity:
3.21 - 3.33
Crystal System:
Orthorhombic
Member of:
Name:
Iron analogue of rockbridgeite.
Unique Identifiers
Mindat ID:
52914
Long-form identifier:
mindat:1:1:52914:9
GUID
(UUID V4):
(UUID V4):
18388424-fc23-4964-80e7-b3af2945dff8
IMA Classification of Ferrorockbridgeite
Approved
IMA Formula:
(Fe2+,Mn2+)2Fe3+3(PO4)3(OH)4(H2O)
Approval year:
2018
First published:
2019
Type description reference:
Grey, Ian E., Kampf, Anthony R., Keck, Erich, Cashion, John D., MacRae, Colin M., Gozukara, Yesim, Peterson, Vanessa K., Shanks, Finlay L. (2019) The rockbridgeite group approved and a new member, ferrorockbridgeite, (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O), described from the Hagendorf Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 31 (2) 389-397 doi:10.1127/ejm/2019/0031-2823
Classification of Ferrorockbridgeite
8.BC.10
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 |
|---|---|---|
| Forck | 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 Ferrorockbridgeite
Colour:
Dark green to black.
Density:
3.21 - 3.33 g/cm3 (Measured) 3.51 g/cm3 (Calculated)
Comment:
Measured using Berman balance with toluene. The low measured value is due to sub-micron porosity.
Optical Data of Ferrorockbridgeite
Type:
Biaxial (-)
RI values:
nα = 1.763(3) nβ = 1.781 nγ = 1.797(3)
2V:
Measured: 87° (1)
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Strong
Pleochroism:
Visible
Comments:
X = blue green, Y = olive green, Z = yellow brown.
Comments:
β is calculated.
X = c, Y = a, Z = b.
Absorption X ≈ Y > Z.
X = c, Y = a, Z = b.
Absorption X ≈ Y > Z.
Chemistry of Ferrorockbridgeite
Mindat Formula:
(Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O)
Crystallography of Ferrorockbridgeite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 13.994(1) Å, b = 16.884(1) Å, c = 5.1866(4) Å
Ratio:
a:b:c = 0.829 : 1 : 0.307
Unit Cell V:
1,225.46 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Blades are flattened on {010} and elongated on [001].
Comment:
Space group is Bbmm
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.987 Å | (21) |
| 4.853 Å | (26) |
| 3.615 Å | (24) |
| 3.465 Å | (33) |
| 3.424 Å | (39) |
| 3.205 Å | (100) |
| 2.774 Å | (22) |
| 1.603 Å | (24) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Ferrorockbridgeite
General Appearance of Type Material:
Densely packed, lustrous, black blades. Individual blades are up to 2 mm in length and roughly 10 µm thick.
Place of Conservation of Type Material:
Mineralogical collections of the Museum Victoria, 11 Nicholson St, Carlton, VIC 3053, Australia, registration number M54126 (holotype), and the Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue nr 67281 (cotype).
Geological Setting of Type Material:
Zoned granitic phosphate pegmatite.
Associated Minerals at Type Locality:
Reference:
Grey, I.E., Kampf, A.R., Keck, E., Cashion, J.D., MacRae, C.M., Gozukara, Y., Peterson, V.K., Shanks, F.L. (2019). The rockbridgeite group approved and a new member, ferrorockbridgeite,(Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O), described from the Hagendorf Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 31(2), 389-397.
Synonyms of Ferrorockbridgeite
Relationship of Ferrorockbridgeite to other Species
Member of:
Other Members of this group:
| Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) | Orth. mmm (2/m 2/m 2/m) |
| Frondelite | Mn2+Fe3+4(PO4)3(OH)5 | Orth. 2 2 2 : C2 2 21 |
| Manganrockbridgeite | Mn2+2Fe3+3(PO4)3(OH)4(H2O) | Mon. 2/m : P21/m |
| Plimerite | ZnFe3+4(PO4)3(OH)5 | Orth. mmm (2/m 2/m 2/m) |
| Rockbridgeite | Fe2+Fe3+4(PO4)3(OH)5 | Orth. mmm (2/m 2/m 2/m) |
Related Minerals - Strunz-mindat Grouping
| 8.BC. | Elaliite | (Fe2+8Fe3+)(PO4)O8 |
| 8.BC. | Elkinstantonite | Fe4(PO4)2O |
| 8.BC. | Manganrockbridgeite | Mn2+2Fe3+3(PO4)3(OH)4(H2O) |
| 8.BC.05 | Angelellite | Fe3+4(AsO4)2O3 |
| 8.BC.10 | Frondelite | Mn2+Fe3+4(PO4)3(OH)5 |
| 8.BC.10 | Rockbridgeite | Fe2+Fe3+4(PO4)3(OH)5 |
| 8.BC.10 | Plimerite | ZnFe3+4(PO4)3(OH)5 |
| 8.BC.10 | Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 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 Ferrorockbridgeite
mindat.org URL:
https://www.mindat.org/min-52914.html
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References for Ferrorockbridgeite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter No 43, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (3) 779-785 doi:10.1180/mgm.2018.72p.781
Grey, Ian E., Kampf, Anthony R., Keck, Erich, Cashion, John D., MacRae, Colin M., Gozukara, Yesim, Peterson, Vanessa K., Shanks, Finlay L. (2019) The rockbridgeite group approved and a new member, ferrorockbridgeite, (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O), described from the Hagendorf Süd pegmatite, Oberpfalz, Bavaria. European Journal of Mineralogy, 31 (2) 389-397 doi:10.1127/ejm/2019/0031-2823
Localities for Ferrorockbridgeite
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.
Germany (TL) | |
| Hålenius et al. (2018) +1 other reference |
USA | |
| SEM/EDS analyzed by Lloyd W. Alexander ... +1 other reference |
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Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany