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Selwynite

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Alfred Richard Cecil Selwyn
Formula:
NaK(Be,Al)Zr2(PO4)4 · 2H2O
System:
Tetragonal
Colour:
Deep purplish blue
Lustre:
Vitreous
Hardness:
4
Member of:
Name:
The name honours Alfred Richard Cecil Selwyn (1824-1902), British born geologist, founding Director of the Geological Survey of Victoria, Australia (1860-1869), and the second Director of the Geological Survey of Canada (1869-1895).
Gainesite Group

Classification of Selwynite

Approved
8.CA.20

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.5.4.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
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First Recorded Occurrence of Selwynite

Year of Discovery:
1995

Physical Properties of Selwynite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Deep purplish blue
Streak:
Lavender, pale
Hardness (Mohs):
4

Crystallography of Selwynite

Crystal System:
Tetragonal
Cell Parameters:
a = 6.57Å, c = 17.14Å
Ratio:
a:c = 1 : 2.609
Unit Cell Volume:
V 739.85 ų (Calculated from Unit Cell)

Optical Data of Selwynite

Type:
Uniaxial (+)
RI values:
nω = 1.624 nε = 1.636
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Selwynite

Formula:
NaK(Be,Al)Zr2(PO4)4 · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Rb,Ca,Sr,Ba,Mg,Mn,Fe,Cs,Ce,Hf,P,Si,F

Relationship of Selwynite to other Species

Member of:
Other Members of Group:
GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2O
8.CA.15Faheyite(Mn,Mg,Na)Be2Fe2(PO4)4 · 6H2O
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
8.CA.30HopeiteZn3(PO4)2 · 4H2O
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2O
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2O
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2O
8.CA.45ScholziteCaZn2(PO4)2 · 2H2O
8.CA.50KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2O
8.CA.60ProsperiteCaZn2(AsO4)(HAsO4)(OH)
8.CA.65GengenbachiteKFe33+(HPO4)4(H2PO4)2 · 6H2O
8.CA.70ParahopeiteZn3(PO4)2 · 4H2O

Other Names for Selwynite

Name in Other Languages:
German:Selwynit
Spanish:Selwynita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Selwynite

Reference List:
Birch, W.D. and D.A.Henry (1993), Phosphate Minerals of Victoria: 39.

Birch, W. D., Pring, A. & Foord, E. E. (1995): Selwynite, NaK(Be,Al)Zr2(PO4)4.2H2O, a new gainesite-like mineral from Wycheproof, Victoria, Australia. Canadian Mineralogist: 33: 55-58.

Mineralogical Record: 27: 120.


Internet Links for Selwynite

Localities for Selwynite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Victoria
    • Buloke Shire
      • Wycheproof
CM 1995, 55-8; W.D.Birch. Phosphate Minerals of Victoria. The Mineralogical Society of Victoria special publication No. 3 pp. 28-32
    • City of Greater Bendigo
Ulrich (1870). Contributions to the mineralogy of Victoria
No reference listed
Mineral and/or Locality  
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