Rosenbergite
A valid IMA mineral species
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About Rosenbergite
Formula:
AlF[F0.5(H2O)0.5]4 · H2O
May also be given as AlF3·3H2O.
Colour:
Colorless
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
2.1
Crystal System:
Tetragonal
Name:
Named in 1993 for Philip E. Rosenberg (b. 1931), geochemist at Washington State University, USA. He was the first to take note of the mineral.
Isostructural with:
The Al analogue of topsøeite. A hydrated counterpart of oskarssonite. Probably identical to UM2008-27-F:AlHO.
Found as aggregates of minute colorless crystals.
Compare 'UM1988-02-F:AlHO' (a lower-hydrate counterpart) and 'Unnamed (Basic Aluminium Fluoride Monohydrate)'.
Found as aggregates of minute colorless crystals.
Compare 'UM1988-02-F:AlHO' (a lower-hydrate counterpart) and 'Unnamed (Basic Aluminium Fluoride Monohydrate)'.
Unique Identifiers
Mindat ID:
3453
Long-form identifier:
mindat:1:1:3453:7
IMA Classification of Rosenbergite
Approved
IMA Formula:
AlF[F0.5(H2O)0.5]4·H2O
Approval year:
1992
First published:
1993
Classification of Rosenbergite
3.CD.05
3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
Dana 7th ed.:
9.3.6.1
9.3.6.1
9 : NORMAL HALIDES
3 : AX3
9 : NORMAL HALIDES
3 : AX3
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 |
|---|---|---|
| Ros | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Rosenbergite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Rosenbergite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
Colroless
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN15=103 kg/mm2 - Vickers
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {001}.
Good on {001}.
Fracture:
Irregular/Uneven
Density:
2.1 g/cm3 (Measured) 2.111 g/cm3 (Calculated)
Optical Data of Rosenbergite
Type:
Uniaxial (-)
RI values:
nω = 1.427 nε = 1.403
Max. Birefringence:
δ = 0.024
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:
Moderate
Chemistry of Rosenbergite
Mindat Formula:
AlF[F0.5(H2O)0.5]4 · H2O
May also be given as AlF3·3H2O.
May also be given as AlF3·3H2O.
Element Weights:
Elements listed:
Crystallography of Rosenbergite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
P4/n
Cell Parameters:
a = 7.715 Å, c = 3.648 Å
Ratio:
a:c = 1 : 0.473
Unit Cell V:
217.13 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tetragonal prisms approx. 0.25 mm in size; found as aggregates of microscopic crystals.
Twinning:
None reported.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006508 | Rosenbergite | Olmi F, Sabelli C, Trosti-Ferroni R (1993) Rosenbergite, AlF[F0.5(H2O)0.5}4.H2O, a new mineral from the Cetine mine (Tuscany, Italy): description and crystal structure European Journal of Mineralogy 5 1167-1174 | 1993 | Cetine mine, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.47 Å | (100) |
| 2.44 Å | (70) |
| 2.03 Å | (70) |
| 1.775 Å | (80) |
| 1.725 Å | (90) |
| 1.388 Å | (70) |
| 1.306 Å | (70) |
| 1.127 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Rosenbergite
General Appearance of Type Material:
radiating tufts
Place of Conservation of Type Material:
University of Florence, Florence, Italy, 1934/RI
Geological Setting of Type Material:
In cavities in highly silicified limestones at the Cetine Mine, Tuscany, Itally; and as a sublimate from fumaroles in the crater of Mt. Erebus, Ross Island, Antarctica (Co-Type Localities.0
Synonyms of Rosenbergite
Other Language Names for Rosenbergite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 3.CD.05 | Topsøeite | FeF[F0.5(H2O)0.5]4 · H2O |
| 3.CD.10 | Prosopite | CaAl2F4[(OH)4-xFx] |
| 3.CD.15 | Jakobssonite | CaAlF5 |
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 Rosenbergite
mindat.org URL:
https://www.mindat.org/min-3453.html
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References for Rosenbergite
Localities for Rosenbergite
Showing 7 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.
Antarctica | |
| 1. Rosenberg (1988) +1 other reference |
Germany | |
| Collected and analysed by Günter Blaß +1 other reference |
Iceland | |
| Jacobsen et al. (2014) |
Italy | |
| Russo et al. (2022) |
| Olmi et al. (1993) +1 other reference |
Poland | |
| Kruszewski et al. (2020) |
Russia | |
| Damdinova et al. (2021) |
Quick NavTopAbout RosenbergiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy