Meta-aluminite Mineral Data

General Meta-aluminite Information

Chemical Formula:

Al2(SO4)(OH)4•5(H2O)

Composition:

Molecular Weight = 308.13 gm

Aluminum 17.51 % Al 33.09 % Al₂O₃

Hydrogen 4.58 % H 40.93 % H₂O

Sulfur 10.41 % S 25.98 % SO₃

Oxygen 67.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(SO₄)(OH)₄•5(H₂O)

IMA Status:

Approved IMA 1968

Locality:

Fumerole uranium mine, Temple Mountain, San Rafael Swell, Every County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the lower hydrate of aluminite.

Meta-aluminite Crystallography

Axial Ratios:

a:b:c =0.4698:1:0.4356

Cell Dimensions:

a = 7.93, b = 16.879, c = 7.353, Z = 4; beta = 106.74° V = 942.49 Den(Calc)= 2.17

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/I_o): 4.48(1), 8.35(0.79), 4.36(0.67),

Physical Properties of Meta-aluminite

Color:

Snow white.

Density:

1.85 - 2.18, Average = 2.01

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Meta-aluminite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2338,KPDmeas= 0.2518,KC= 0.2536
Ncalc = 1.47 - 1.55

Optical Data:

Biaxial (-), a=1.497, b=1.512, g=1.513, bire=0.0160

Calculated Properties of Meta-aluminite

Electron Density:

Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Meta-aluminite =2.02 gm/cc.

Fermion Index:

Fermion Index = 0.001111366
Boson Index = 0.998888634

Photoelectric:

PE_{Meta-aluminite}= 1.25 barns/electron
U=PE_{Meta-aluminite} x rElectron Density= 2.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Meta-aluminite is Not Radioactive

Meta-aluminite Classification

Dana Class:

31.07.05.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.07)where (A+ B++)2 (XO4) Zqï¿½x(H2O)

(31.07.05)Dana Group

31.07.05.01 Meta-aluminite Al2(SO4)(OH)4•5(H2O) P 2₁/c ? 2/m

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 Meta-aluminite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Meta-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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Meta-aluminite Specimen Label here :

Meta-aluminite

Al2(SO4)(OH)4•5(H2O)
Dana No: 31.07.05.01 Strunz No: 07.DC.05
Locality:

Notes:

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