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Rosenbergite

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Formula:
AlF
 
3
· 3H
 
2
O
System:TetragonalColour:Colorless
Hardness:3 - 3½
Name:Named in 1993 for Philip E. Rosenberg (b.1931), geochemist at Washington State University, USA.


Found as aggregates of minute colorless crystals.

Classification of Rosenbergite

IMA status:Approved 1992
Nickel-Strunz 10th (pending) edition ID:3.CD.05

3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
Dana 7th edition ID:9.3.6.1
Dana 8th edition ID:9.3.6.1

9 : NORMAL HALIDES
3 : AX3
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Type Occurrence of Rosenbergite

Type Locality:Le Cetine di Cotorniano Mine (Le Cetine Mine; Cetine Mine; Rosia), Chiusdino, Siena Province, Tuscany, Italy
Year of Discovery:1992
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

Physical Properties of Rosenbergite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless
Streak:Colroless
Hardness (Mohs):3 - 3½
Hardness (Vickers):VHN15=103 kg/mm2
Hardness Data:Measured
Tenacity:Brittle
Cleavage:Distinct/Good
Good on {001}.
Fracture:Irregular/Uneven
Density (measured):2.1 g/cm3
Density (calculated):2.111 g/cm3

Crystallography of Rosenbergite

Crystal System:Tetragonal
Class (H-M):4/m - Dipyramidal
Space Group:P4/n
Cell Parameters:a = 7.715Å, c = 3.648Å
Ratio:a:c = 1 : 0.473
Unit Cell Volume: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:
d-spacingIntensity
5.47(100)
2.44(70)
2.03(70)
1.775(80)
1.725(90)
1.388(70)
1.306(70)
1.127(70)

Optical Data of Rosenbergite

Type:Uniaxial (-)
RI values: nω = 1.427 nε = 1.403
Maximum Birefringence:δ = 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Rosenbergite

Formula:
AlF
 
3
· 3H
 
2
O
Simplified for copy/paste:AlF3·3H2O
Essential elements:Al, F, H, O
All elements listed in formula:Al, F, H, O

Relationship of Rosenbergite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.CD.10Prosopite
CaAl
 
2
(F,OH)
 
8

Other Names for Rosenbergite

Synonyms:
IMA1992-046
Other Languages:
German:Rosenbergit
Russian:Розенбергит
Spanish:Rosenbergita

Other Information

Health Warning: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:

- +
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

Search Engines:
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  • External Links:
  • Look for Rosenbergite on Webmineral
  • Look for Rosenbergite on Athena Mineralogy
  • Look for Rosenbergite on Wikipedia
  • Look for Rosenbergite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Rosenbergite details from Handbook of Mineralogy (PDF)
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  • Localities for Rosenbergite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
        • Ross Island
    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
     
    • North Rhine-Westphalia
      • Aachen
        • Alsdorf
    Collected and analysed by Günter Blaß
    Iceland
     
    • Vestmannaeyjar archipelago (Westman islands)
      • Heimaey island
        • Heimaey
    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
     
    • Tuscany
      • Siena Province
        • Chiusdino
    Eur.J.Min.(1993) 5, 1167-1174
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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