Alunogen Mineral Data

Alunogen Mineral Data +

General Alunogen Information

Chemical Formula:

Al2(SO4)3·17(H2O)

Composition:

Molecular Weight = 648.41 gm

Aluminum 8.32 % Al 15.72 % Al₂O₃

Hydrogen 5.29 % H 47.23 % H₂O

Sulfur 14.84 % S 37.04 % SO₃

Oxygen 71.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(SO₄)₃·17(H₂O)

Environment:

Secondary mineral commonly associated with coals and pyritiferous shales in arid regions.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Alum Mountain district, Grant County, New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

From the Latin alumen ="alum" and the Greek genos ="origin."

Synonym:

Aluminum Sulfate

Doughtyite

ICSD 4292

Keramohalite

PDF 26-1010

Alunogen Image

Images:

Alunogen Jarosite

Comments: Colorless to white, tabular crystals alunogen on reddish jarosite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Alunogen Metavoltine

Comments: Yellow metavoltine with white alunogen.
Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Alunogen Voltaite

Comments: Dark greenish-black crystals of voltaite on white alunogen.
Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Alunogen Crystallography

Axial Ratios:

a:b:c =0.2751:1:0.2247

Cell Dimensions:

a = 7.42, b = 26.97, c = 6.062, Z = 2; alpha = 89.95°, beta = 97.566°, gamma = 91.888° V = 1,201.90 Den(Calc)= 1.79

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.49(1), 4.33(0.8), 4.39(0.8),13.5(0.6), 3.68(0.5), 3.9(0.5), 3.02(0.4),

Forms:

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Forms: [ 0 1 0] [ 1 4 0] [ 1 1 0] [ 1 1 1] [ 1 0 0]

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Crystal Structure:

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Fang J H , Robinson P D , American Mineralogist , 61 (1976) p.311-317, Alunogen, Al2(H2O)12(SO4)3.5H2O: Its atomic arrangement and water content

View Additional jPOWD Structure files for Alunogen
[1]

Physical Properties of Alunogen

Cleavage:

[010] Perfect, [100] Very Good, [313] Distinct

Color:

White, Yellowish white, Reddish white, Yellowish white.

Density:

1.65 - 1.78, Average = 1.71

Diaphaniety:

Transparent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Alunogen

Gladstone-Dale:

CI meas= -0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2657,KPDmeas= 0.2774,KC= 0.2587

Optical Data:

Biaxial (+), a=1.473, b=1.474, g=1.48, bire=0.0070, 2V(Calc)=46, 2V(Meas)=31-69. Dispersion none.

Calculated Properties of Alunogen

Electron Density:

r_electron=1.88 gm/cc
note: r_Alunogen=1.79 gm/cc.

Fermion Index

Fermion Index = 0.00146
Boson Index = 0.99854

Photoelectric:

PE_Alunogen= 1.26 barns/electron
U=PE_Alunogen x r_electron= 2.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alunogen is Not Radioactive

Alunogen Classification

Dana Class:

29.8.6.1 (29)Hydrated Acid and Sulfates

(29.8)where (A)2 (XO4)3 · x(H2O)

(29.8.6)Dana Group

29.8.6.1 Alunogen Al2(SO4)3·17(H2O) P1 1

Strunz Class:

VI/C.08-70 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.08 - Rhomboclase - Meta-alunogen series

VI/C.08-10 Rhomboclase (H5O2)Fe(SO4)2·2(H2O) P nma 2/m 2/m 2/m

VI/C.08-20 Lausenite Fe2(SO4)3·6(H2O) Unk. Mono

VI/C.08-30 Kornelite Fe2(SO4)3·7(H2O) P 2₁/c 2/m

VI/C.08-40 Coquimbite Fe2(SO4)3·9(H2O) P 3c 3 2/m

VI/C.08-50 Paracoquimbite Fe2(SO4)3·9(H2O) R 3 3

VI/C.08-60 Quenstedtite Fe2(SO4)3·10(H2O) P1 1

VI/C.08-70 Alunogen Al2(SO4)3·17(H2O) P1 1

VI/C.08-80 Meta-alunogen Al4(SO4)6·27(H2O) Mono

Other Alunogen Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Alunogen :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 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

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Alunogen

Al2(SO4)3·17(H2O)
Dana No: 29.8.6.1 Strunz No: VI/C.08-70
Locality:

Notes: