Alunogen Mineral Data

Alunogen Mineral Data
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General Alunogen Information

Help on Chemical Formula: Chemical Formula: Al2(SO4)3•17(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al2(SO4)3•17(H2O)
Help on Environment: Environment: Secondary mineral commonly associated with coals and pyritiferous shales in arid regions.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1832
Help on Locality: Locality: Alum Mountain district, Grant County, New Mexico, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin alumen ="alum" and the Greek genos ="origin."
Help on Name Pronunciation: Name Pronunciation: Alunogen Say ALUNOGEN
Help on Synonym: Synonym: Aluminum Sulfate
  Doughtyite
  ICSD 4292
  Keramohalite
  PDF 26-1010
 

Alunogen Image

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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
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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
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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.2751:1:0.2247
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),
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Forms: ( 0 1 0) ( 1 4 0) ( 1 1 0) ( 1 1 1) ( 1 0 0)

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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

Help on Cleavage: Cleavage: {010} Perfect, {100} Very Good, {313} Distinct
Help on Color: Color: White, Yellowish white, Reddish white, Yellowish white.
Help on Density: Density: 1.65 - 1.78, Average = 1.71
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Alunogen

Help on Gladstone-Dale: 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
Ncalc = 1.43 - 1.46
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.88 gm/cc
note: Specific Gravity of Alunogen =1.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014640919
Boson Index = 0.9985359081
Help on Photoelectric: Photoelectric: PEAlunogen = 1.26 barns/electron
U=PEAlunogen x rElectron Density= 2.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alunogen is Not Radioactive
 

Alunogen Classification
Help on Dana Class: Dana Class: 29.08.06.01 (29)Hydrated Acid and Sulfates
  (29.08)where (A)2 (XO4)3 · x(H2O)
  (29.08.06)Dana Group
 
29.08.06.01 Alunogen Al2(SO4)3•17(H2O) P1 1
Help on Strunz Class: Strunz Class: 07.CB.45 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.45 Alunogen Al2(SO4)3•17(H2O) P1 1
 
07.CB.45 Meta-alunogen Al4(SO4)6•27(H2O) Mono
 

Other Alunogen Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Alunogen :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Alunogen

Al2(SO4)3•17(H2O)
Dana No: 29.08.06.01 Strunz No: 07.CB.45
Locality:

 

Notes: