Waylandite Mineral Data

General Waylandite Information

Chemical Formula:

BiAl3(PO4)2(OH)6

Composition:

Molecular Weight = 581.91 gm

Aluminum 13.91 % Al 26.28 % Al₂O₃

Bismuth 35.91 % Bi 40.04 % Bi₂O₃

Phosphorus 10.65 % P 24.39 % P₂O₅

Hydrogen 1.04 % H 9.29 % H₂O

Oxygen 38.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BiAl₃(PO₄)₂(OH)₆

Environment:

Rare secondary mineral replacing primary bismuth minerals.

IMA Status:

Approved IMA 1962

Locality:

Wampewo pegmatite, Gamba Hill, near Kampala, southwest Uganda. Link to MinDat.org Location Data.

Name Origin:

Named for Edgar James Wayland, first Director of the Uganda Geological Survey.

Name Pronunciation:

Waylandite + Pronunciation

Waylandite Image

Images:

Waylandite Bismite

Comments: Gray massive stream rounded waylandite with tan bismite crusts.
Location: Mumba, Nord-Kivu, Zaire. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Waylandite Crystallography

Axial Ratios:

a:c = 1:2.3162

Cell Dimensions:

a = 6.9834, c = 16.175, Z = 3; V = 683.14 Den(Calc)= 4.24

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.93(1), 5.66(0.71), 3.483(0.5),

Physical Properties of Waylandite

Color:

White, Light brown.

Density:

3.86

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Waylandite

Gladstone-Dale:

CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1795,KPDmeas= 0.1972,KC= 0.1919
Ncalc = 1.74 - 1.81

Optical Data:

Uniaxial (-), e=1.748, w=1.774, bire=0.0260.

Calculated Properties of Waylandite

Electron Density:

Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Waylandite =3.86 gm/cc.

Fermion Index:

Fermion Index = 0.0001866814
Boson Index = 0.9998133186

Photoelectric:

PE_Waylandite= 623.81 barns/electron
U=PE_Waylandite x rElectron Density=2,234.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Waylandite is Not Radioactive

Waylandite Classification

Dana Class:

41.05.12.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.12)Waylandite Group

41.05.12.01 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

41.05.12.02 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

41.05.12.03 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

41.05.12.04 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

Strunz Class:

08.BL.13 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.13 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

08.BL.13 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Waylandite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Waylandite :
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
15 - WWW-MINCRYST

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

Waylandite

BiAl3(PO4)2(OH)6
Dana No: 41.05.12.01 Strunz No: 08.BL.13
Locality:

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