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Rosenbergite

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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.
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)'.


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Classification of RosenbergiteHide

Approved
Approval Year:
1992
3.CD.05

3 : HALIDES
C : Complex halides
D : Ino-aluminofluorides
Dana 7th ed.:
9.3.6.1
9.3.6.1

9 : NORMAL HALIDES
3 : AX3

Pronounciation of RosenbergiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RosenbergiteHide

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}.
Fracture:
Irregular/Uneven
Density:
2.1 g/cm3 (Measured)    2.111 g/cm3 (Calculated)

Optical Data of RosenbergiteHide

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.
Surface Relief:
Moderate

Chemical Properties of RosenbergiteHide

Formula:
AlF[F0.5(H2O)0.5]4·H2O

may also be given as AlF3.H2O
IMA Formula:
AlF[F0.5(H2O)0.5]4 · H2O

Crystallography of RosenbergiteHide

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 DiffractionHide

Powder Diffraction Data:
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)

Type Occurrence of RosenbergiteHide

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 RosenbergiteHide

Other Language Names for RosenbergiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Gypsum1 photo of Rosenbergite associated with Gypsum on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.CD.10ProsopiteCaAl2(F,OH)8Mon. 2/m : B2/b

Other InformationHide

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 RosenbergiteHide

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 RosenbergiteHide

Localities for RosenbergiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
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; 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
 
  • Southern Region
    • 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 (TL)
 
  • Tuscany
    • Siena Province
      • Chiusdino
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.
Mineral and/or Locality  
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