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Rosenbergite

A valid IMA mineral species
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About RosenbergiteHide

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)'.


Unique IdentifiersHide

Mindat ID:
3453
Long-form identifier:
mindat:1:1:3453:7
GUID
(UUID V4):
17910706-d9f8-4f99-91fa-99b49812f6f6

IMA Classification of RosenbergiteHide

Classification of RosenbergiteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
RosIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of RosenbergiteHide

Pronunciation:
PlayRecorded byCountry
Jolyon 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

Chemistry of RosenbergiteHide

Mindat Formula:
AlF[F0.5(H2O)0.5]4 · H2O

May also be given as AlF3·3H2O.

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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006508RosenbergiteOlmi 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 1167-11741993Cetine mine, Tuscany, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 RosenbergiteHide

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
Reference:
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.

Synonyms of RosenbergiteHide

Other Language Names for RosenbergiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Rosenbergite associated with GypsumCaSO4 · 2H2O
1 photo of Rosenbergite associated with MopungiteNa[Sb5+(OH)6]

Related Minerals - Strunz-mindat GroupingHide

3.CD.05TopsøeiteFeF[F0.5(H2O)0.5]4 · H2OTet. 4/m : P4/n
3.CD.10ProsopiteCaAl2F4[(OH)4-xFx]Mon. 2/m : B2/b
3.CD.15JakobssoniteCaAlF5Mon. 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.

Internet Links for RosenbergiteHide

References 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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • Ross Archipelago
        • Ross Island
1. Rosenberg (1988) +1 other reference
Germany
 
  • North Rhine-Westphalia
    • Cologne
      • Aachen
        • Alsdorf
Collected and analysed by Günter Blaß +1 other reference
Iceland
 
  • Southern Region
    • Vestmannaeyjar
      • Vestmannaeyjar archipelago (Westman islands)
        • Heimaey island
Jacobsen et al. (2014)
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
        • Mount Vesuvius
Russo et al. (2022)
  • Tuscany
    • Siena Province
      • Chiusdino
Olmi et al. (1993) +1 other reference
Poland
 
  • Silesian Voivodeship
    • Wodzisław County
      • Radlin
Kruszewski et al. (2019)
Russia
 
  • Buryatia
    • Dzhida Basin
      • Zakamensk District
        • Dzhida W-Mo District
Damdinova et al. (2021)
 
Mineral and/or Locality  
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