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Rosenbergite

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Formula:
AlF3 · 3H2O
System:
Tetragonal
Colour:
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

Approved 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
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First Recorded Occurrence of Rosenbergite

Year of Discovery:
1992
Geological Setting of First Recorded 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

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:
2.1 g/cm3 (Measured)    2.111 g/cm3 (Calculated)

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 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)

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.
Surface Relief:
Moderate

Chemical Properties of Rosenbergite

Formula:
AlF3 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Rosenbergite to other Species

Other Names for Rosenbergite

Name in Other Languages:

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:
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

Localities for Rosenbergite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
Mineral and/or Locality  
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