Mineralogy Database

Aluminite Mineral Data

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General Aluminite Information

Help on Chemical  Formula: Chemical Formula: Al2(SO4)(OH)4•7(H2O)
Help on Composition: Composition: Molecular Weight = 344.16 gm
   Aluminum  15.68 %  Al   29.63 % Al2O3
   Hydrogen   5.27 %  H    47.11 % H2O
   Sulfur     9.32 %  S    23.26 % SO3
   Oxygen    69.73 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2(SO4)(OH)4•7(H2O)
Help on Environment: Environment: Formed in recent or Tertiary clays, marls, and lignites by the action of sulfate solutions derived from the alteration of pyrite or marcasite on aluminous silicates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1807
Help on Locality: Locality: Halle, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition.
Help on Name Pronunciation: Name Pronunciation: Aluminite + Pronunciation Say ALUMINITE
Help on Synonym: Synonym: ICSD 2234
  PDF 43-669

Aluminite Image

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Comments: Snow-white, very pure nodules of aluminite.
Location: Newhaven, Sussex, Great Britain. Scale: 5.5 x 3 cm.
© John Veevaert

Aluminite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4774:1:0.7508
Help on Cell Dimensions: Cell Dimensions: a = 7.44, b = 15.583, c = 11.7, Z = 4; beta = 110.18° V = 1,273.20 Den(Calc)= 1.80
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.977(1), 7.791(0.87), 4.696(0.48),

Physical Properties of Aluminite

Help on Cleavage: Cleavage: None
Help on Color: Color: White, Grayish white.
Help on Density: Density: 1.66 - 1.7, Average = 1.68
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).
Help on Hardness: Hardness: 1 - Talc
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Aluminite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.258,KPDmeas= 0.2764,KC= 0.2627
Ncalc = 1.44 - 1.47
Help on Optical Data: Optical Data: Biaxial (+), a=1.459, b=1.464, g=1.47, bire=0.0110, 2V(Calc)=86, 2V(Meas)=90. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.

Calculated Properties of Aluminite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.88 gm/cc
note: Specific Gravity of Aluminite =1.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010414022
Boson Index = 0.9989585978
Help on Photoelectric: Photoelectric: PEAluminite = 1.15 barns/electron
U=PEAluminite x rElectron Density= 2.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aluminite is Not Radioactive

Aluminite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.07)where (A+ B++)2 (XO4) Zq�x(H2O)
  (31.07.04)Dana Group Aluminite Al2(SO4)(OH)4•7(H2O) P 21/c 2/m Mangazeite! Al2(SO4)(OH)4•3H2O P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 07.DC.05 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DC -With only medium-sized cations; chains of corner-sharing octahedra
07.DC.05 Aluminite Al2(SO4)(OH)4•7(H2O) P 21/c 2/m
07.DC.05 Meta-aluminite Al2(SO4)(OH)4•5(H2O) P 21/c ? 2/m

Other Aluminite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Aluminite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.DC.05





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