Rosenbergite
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About Rosenbergite
Formula:
AlF[F0.5(H2O)0.5]4·H2O
may also be given as AlF3.H2O
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.
Type Locality:
Isostructural with:
The Al analogue of topsøeite. A hydrated counterpart of oskarssonite.
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)'.
Classification of Rosenbergite
Approved
Approval Year:
1992
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
Pronounciation of Rosenbergite
Pronounciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon & Katya 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
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:
Moderate
Chemical Properties of Rosenbergite
Formula:
AlF[F0.5(H2O)0.5]4·H2O
may also be given as AlF3.H2O
may also be given as AlF3.H2O
IMA Formula:
AlF[F0.5(H2O)0.5]4 · H2O
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.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.47 | (100) |
| 2.44 | (70) |
| 2.03 | (70) |
| 1.775 | (80) |
| 1.725 | (90) |
| 1.388 | (70) |
| 1.306 | (70) |
| 1.127 | (70) |
Type Occurrence of Rosenbergite
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
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 3.CD.10 | Prosopite | CaAl2F4[(OH)4-xFx], x = 0.0–1.0 | Mon. 2/m : B2/b |
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.
References for Rosenbergite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 (1993): 5: 1167-1174.
Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig, Vandall T. King (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 390.
Internet Links for Rosenbergite
mindat.org URL:
https://www.mindat.org/min-3453.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Rosenbergite
ⓘ - Click for 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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)
All localities listed without proper references should be considered as questionable.
- 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, P.E. (1988): Aluminum fluoride hydrates, volcanogenic salts from Mount Erebus, Antarctica. American Mineralogist, 73, 855-860; 2. Ciriotti, M.E., Fascio, L., Pasero, M. (2004): Italian Type Minerals. Felici, Ed., Pisa, CD-ROM. |
Germany | |
| Collected and analysed by Günter Blaß; Witzke, T., de Wit, F., Kolitsch, U. and Blaß, G. (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, pp. 203-240, in: Stracher, G. B., Prakash, A. and Sokol, E. V.: Coal and Peat Fires: A Global Perspective, Volume 3: Case Studies - Coal Fires, Elsevier, 786 pp. |
Iceland | |
| Jacobsen, M.J., Balić-Žunić, T., Mitolo, D., Katerinopoulou, A., Garavelli, A., Jakobsson, S.P. (2014): Oskarssonite, AlF3, a new fumarolic mineral from Eldfell volcano, Heimaey, Iceland. Mineralogical Magazine,78, 215-222. (p. 221) |
Italy (TL) | |
| European Journal of Mineralogy(1993) 5, 1167-1174; Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p. |
Le Cetine di Cotorniano Mine, Chiusdino, Siena Province, Tuscany, Italy