Doyleite Mineral Data

Doyleite Mineral Data +

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General Doyleite 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

IMA Status:

Approved IMA 1985

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 50581

IMA1980-041

PDF 38-376

Doyleite Image

Images:

Doyleite Gibbsite

Comments: Botryoidal spheres of doyleite growing along with its dimorph gibbsite. Analysis shows that doyleite dominates the mix. There are also minor canary yellow phlogopite crystals.
Location: Baoshan, Yunnan, China. Scale: 8 x 6.5 x 1.9 cm.
© Fabre Minerals

Doyleite Crystallography

Axial Ratios:

a:b:c =0.9665:1:0.9623

Cell Dimensions:

a = 5.002, b = 5.175, c = 4.98, Z = 2; alpha = 97.5°, beta = 118.6°, gamma = 104.74° V = 108.52 Den(Calc)= 2.39

Crystal System:

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

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

By Intensity(I/I_o): 4.794(1), 2.36(0.4), 1.972(0.3),

Physical Properties of Doyleite

Cleavage:

[010] Perfect, [100] Distinct

Color:

White, Creamy white, Bluish white.

Density:

2.48

Diaphaniety:

Transparent to Opaque

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Doyleite

Gladstone-Dale:

CI meas= 0.116 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2321,KPDmeas= 0.2237,KC= 0.2531

Optical Data:

Biaxial (+), a=1.545, b=1.553, g=1.566, bire=0.0210, 2V(Calc)=78, 2V(Meas)=77.

Calculated Properties of Doyleite

Electron Density:

r_electron=2.45 gm/cc
note: r_Doyleite=2.39 gm/cc.

Fermion Index

Fermion Index = 0.0003
Boson Index = 0.9997

Photoelectric:

PE_Doyleite= 1.10 barns/electron
U=PE_Doyleite x r_electron= 2.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Doyleite is Not Radioactive

Doyleite Classification

Dana Class:

6.3.4.1 (6)Hydroxides and Oxides Containing Hydroxyl

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

(6.3.4)Dana Group

6.3.4.1 Doyleite Al(OH)3 P1 1

Strunz Class:

IV/F.02-40 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 Doyleite Information

References:

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

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

Doyleite

Al(OH)3
Dana No: 6.3.4.1 Strunz No: IV/F.02-40
Locality:

Notes: