Nordstrandite Mineral Data

Nordstrandite Mineral Data +

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General Nordstrandite Information

Chemical Formula:

Al(OH)3

Composition:

Molecular Weight = 78.00 gm

Aluminum 34.59 % Al 65.36 % Al₂O₃

Hydrogen 3.88 % H 34.64 % H₂O

Oxygen 61.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(OH)₃

Environment:

Weathering product of bauxitic soils derived from limestone. Vein or fissure-filling material in dolomitic oil shale. Alteration product of aluminum carbonate minerals. Late-stage m ineral in nepheline syenite pegmatites

IMA Status:

Approved IMA 1958

Locality:

Gunony Kapor, near Bau, Sarawak, Malaysia. Link to MinDat.org Location Data.

Name Origin:

Named for R. A. van Nordstrand (1817-), Sinclair Research Laboratories, who first synthesized the compound.

Synonym:

ICSD 24466

PDF 24-6

Nordstrandite Image

Images:

Nordstrandite

Comments: Large pale brownish crystals of nordstrandite.
Location: B?renstein Quarry, Niederschlag, Oberwiesenthal, Erzgebirge, Saxony, Germany. Scale: Picture size 35 mm.
© Thomas Witzke / Abraxas-Verlag

Nordstrandite Crystallography

Axial Ratios:

a:b:c =0.8863:1:0.7315

Cell Dimensions:

a = 6.148, b = 6.936, c = 5.074, Z = 4; alpha = 95.76°, beta = 99.06°, gamma = 83.3° V = 211.14 Den(Calc)= 2.45

Crystal System:

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

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

By Intensity(I/I_o): 4.78(1), 2.26(0.4), 2.39(0.4),

Crystal Structure:

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Bosmans H J , Acta Crystallographica, Section B , 26 (1970) p.649-652, Unit cell and crystal structure of nordstrandite, Al(OH)3, Locality: synthetic

View Additional jPOWD Structure files for Nordstrandite
[1]

Physical Properties of Nordstrandite

Cleavage:

[110] Perfect

Color:

Beige, Colorless, Light brown, Light green, Pink.

Density:

2.42

Diaphaniety:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Nordstrandite

Gladstone-Dale:

CI meas= 0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2401,KPDmeas= 0.2431,KC= 0.2531

Optical Data:

Biaxial (+), a=1.58, b=1.583, g=1.602, bire=0.0220, 2V(Calc)=44, 2V(Meas)=24. Dispersion r < v moderate.

Calculated Properties of Nordstrandite

Electron Density:

r_electron=2.48 gm/cc
note: r_{Nordstrandite}=2.42 gm/cc.

Fermion Index

Fermion Index = 0.0003
Boson Index = 0.9997

Photoelectric:

PE_{Nordstrandite}= 1.10 barns/electron
U=PE_{Nordstrandite} x r_electron= 2.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nordstrandite is Not Radioactive

Nordstrandite Classification

Dana Class:

6.3.3.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.3)with (OH)3 or (OH)6 groups

(6.3.3)Dana Group

6.3.3.1 Nordstrandite Al(OH)3 P1 1

Strunz Class:

IV/F.02-30 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.02 - Gibbsite - Doyleite series

IV/F.02-10 Gibbsite Al(OH)3 P 2₁/n 2/m

IV/F.02-20 Bayerite Al(OH)3 P 2₁/a 2/m

IV/F.02-30 Nordstrandite Al(OH)3 P1 1

IV/F.02-40 Doyleite Al(OH)3 P1 1

Other Nordstrandite Information

References:

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

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Print or Cut-and-Paste your Nordstrandite Specimen Label here :

Nordstrandite

Al(OH)3
Dana No: 6.3.3.1 Strunz No: IV/F.02-30
Locality:

Notes: