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 % Al2 O3
Bismuth 35.91 % Bi 40.04 % Bi2 O3
Phosphorus 10.65 % P 24.39 % P2 O5
Hydrogen 1.04 % H 9.29 % H2 O
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 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 3 m
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEWaylandite = 623.81 barns/electronU=PEWaylandite x r Electron 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 3 m 3 2/m
41.05.12.02 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3 m 3 2/m
41.05.12.03 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3 m 3 2/m
41.05.12.04 Arsenogorceixite ! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3 m 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 3 m 3 2/m
08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3 m 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 3 m 3 2/m
08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3 m 3 2/m
08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3 m 3 2/m
08.BL.13 Graulichite-(Ce) ! CeFe3(AsO4)2(OH)6 R 3 m 3 2/m
08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3 m 3 2/m
08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3 m 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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Waylandite
BiAl3(PO4)2(OH)6
Dana No: 41.05.12.01 Strunz No: 08.BL.13
Locality:
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