Rosenbergite Mineral Data

Rosenbergite Mineral Data +

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General Rosenbergite Information

Chemical Formula:

AlF3·3(H2O)

Composition:

Molecular Weight = 157.02 gm

Aluminum 17.18 % Al 32.47 % Al₂O₃

Hydrogen 3.85 % H 34.42 % H₂O

Oxygen 30.57 % O

Fluorine 48.40 % F 48.40 % F

- % F -20.38 % -O=F₂

______ ______

100.00 % 94.91 % = TOTAL OXIDE

Empirical Formula:

AlF₄·3(H₂O)

Environment:

Cavities in highly silicified limestone (Italy) and fumaroles (Antarctica).

IMA Status:

Approved IMA 1993

Locality:

Cetine mine, Tuscany, Italy and Mt. Erebus, Ross Island, Antarctica. Link to MinDat.org Location Data.

Name Origin:

Named for Philip E. Rosenberg (1931-), U.S. Geochemist, Washington State University.

Synonym:

ICSD 66691

IMA1992-046

PDF 46-1459

Rosenbergite Image

Images:

Rosenbergite

Comments: Colorless prismatic crystals of rosenbergite on a dark matrix.
Location: Cetine di Cotorniano Mine (Cetine Mine; Tafone Mine), Rosia, Siena, Tuscany, Italy. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Rosenbergite Crystallography

Axial Ratios:

a:c = 1:0.47284

Cell Dimensions:

a = 7.715, c = 3.648, Z = 2; V = 217.13 Den(Calc)= 2.40

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.47(1), 1.725(0.85), 1.775(0.78),

Crystal Structure:

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Olmi F , Sabelli C , Trosti-Ferroni R , European Journal of Mineralogy , 5 (1993) p.1167-1174, Rosenbergite, AlF[F0.5(H2O)0.5}4.H2O, a new mineral from the, Cetine mine (Tuscany, Italy): description and crystal structure, Locality: Cetine mine, Tuscany, Italy

Physical Properties of Rosenbergite

Cleavage:

[???] Good

Color:

Colorless.

Density:

2.1

Diaphaniety:

Transparent

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rosenbergite

Gladstone-Dale:

CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.165 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1729,KPDmeas= 0.1976,KC= 0.207

Optical Data:

Uniaxial (-), e=1.403, w=1.427, bire=0.0240.

Calculated Properties of Rosenbergite

Electron Density:

r_electron=2.11 gm/cc
note: r_Rosenbergite=2.10 gm/cc.

Fermion Index

Fermion Index = 0.00015
Boson Index = 0.99985

Photoelectric:

PE_Rosenbergite= 0.87 barns/electron
U=PE_Rosenbergite x r_electron= 1.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rosenbergite is Not Radioactive

Rosenbergite Classification

Dana Class:

9.3.6.1 (9)Anhydrous and Hydrated Halides

(9.3)Dana Type

(9.3.6)Dana Group

9.3.6.1 Rosenbergite AlF3·3(H2O) P 4/n 4/m

Strunz Class:

III/C.03-55 III - Halogenides

III/C - Double halogenides with water, Fluorides

III/C.03 - Prosopite - Boldyrevite series

III/C.03-10 Prosopite CaAL2(F,OH)8 A2/a 2/m

III/C.03-20 Chiolite Na5Al3F14 P 4/mnc 4/m 2/m 2/m

III/C.03-30 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m

III/C.03-40 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

III/C.03-45 Karasugite SrCaAl(F,OH)7 P 2₁/c 2/m

III/C.03-50 Carlhintzeite Ca2AlF7·(H2O) C1,C1 Tri

III/C.03-55 Rosenbergite AlF3·3(H2O) P 4/n 4/m

III/C.03-60 Ralstonite NaxMgxAl2-x(F,OH)6·(H2O) F d3m 4/m 3 2/m

III/C.03-70 Neighborite NaMgF3 Pcmn 2/m 2/m 2/m

III/C.03-80 Boldyrevite* NaCaMgAl3F14·4(H2O) None

Other Rosenbergite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p765,1994) OPTIC PROP.(Am.Min.,Vol.79,p765,1994)

See Also:

Links to other databases for Rosenbergite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Rosenbergite

AlF3·3(H2O)
Dana No: 9.3.6.1 Strunz No: III/C.03-55
Locality:

Notes: