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Selwynite

A valid IMA mineral species
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06654720014946664325117.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
08284790014946664321847.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
09185350014946664325927.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
06654720014946664325117.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
08284790014946664321847.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
09185350014946664325927.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
06654720014946664325117.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
08284790014946664321847.jpg
Selwynite

Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
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About SelwyniteHide

00504900014946664331927.jpg
Alfred Richard Cecil Selwyn
Formula:
NaK(Be,Al)Zr2(PO4)4 · 2H2O
Colour:
Deep purplish blue
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.08 (Calculated)
Crystal System:
Tetragonal
Member of:
Gainesite Group
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


Unique IdentifiersHide

Mindat ID:
7287
Long-form identifier:
mindat:1:1:7287:4
GUID
(UUID V4):
e0767a43-5a75-4650-9b6f-81ce81ae5fb6

IMA Classification of SelwyniteHide

Classification of SelwyniteHide

Strunz-mindat (2024):
8.CA.20

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SwyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SelwyniteHide

Lustre:
Vitreous
Transparency:
Transparent, Translucent
Colour:
Deep purplish blue
Comment:
may be pale lavender if weathered.
Streak:
Lavender, pale
Hardness:
4 on Mohs scale
Fracture:
Sub-Conchoidal
Density:
3.08 g/cm3 (Calculated)

Optical Data of SelwyniteHide

Type:
Uniaxial (+)
RI values:
nω = 1.624(2) nε = 1.636(2)
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
Pleochroism:
Visible
Comments:
O = medium bluish lavender; E = very pale bluish lavender.

Chemistry of SelwyniteHide

Mindat Formula:
NaK(Be,Al)Zr2(PO4)4 · 2H2O
Elements listed:
Al, Be, H, K, Na, O, P, Zr - search for minerals with similar chemistry
Common Impurities:
Rb,Ca,Sr,Ba,Mg,Mn,Fe,Cs,Ce,Hf,P,Si,F

Crystallography of SelwyniteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Setting:
I41/amd
Cell Parameters:
a = 6.570(3) Å, c = 17.142(6) Å
Ratio:
a:c = 1 : 2.609
Unit Cell V:
739.93 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.161 Å(100)
3.286 Å(50)
3.039 Å(30)
4.291 Å(25)
2.895 Å(20)
2.609 Å(5)
2.431 Å(5)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)

Type Occurrence of SelwyniteHide

Type Locality:
ⓘ Wycheproof granite quarry, Wycheproof, Buloke Shire, Victoria, Australia
General Appearance of Type Material:
anhedral, indistinct, in radiating groups
Place of Conservation of Type Material:
Museum Victoria, Melbourne, Australia, M42492, M42590.
Associated Minerals at Type Locality:
WarditeEosphoriteMontmorilloniteLimonite
Reference:
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.

Synonyms of SelwyniteHide

Other Language Names for SelwyniteHide

German:Selwynit
Spanish:Selwynita

Relationship of Selwynite to other SpeciesHide

Member of:
Gainesite Group
Other Members of this group:
GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Selwynite associated with RockbridgeiteFe2+Fe3+4(PO4)3(OH)5
1 photo of Selwynite associated with CyriloviteNaFe3+3(PO4)2(OH)4 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2 · 4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4) · 9H2OTric. 1 : P1
8.CA.BrandãoiteBeAl2(PO4)2(OH)2(H2O)5Tric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OMon. 2/m : P21/b
8.CA.05ParafransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.15FaheyiteBe2Mn2+Fe3+2(PO4)4 · 6H2OTrig. 3 2 : P31 2 1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZnZn2(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30NizamoffiteMn2+Zn2(PO4)2(H2O)4Orth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.30Unnamed (Mg-analogue of Hopeite)Mg3(PO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.42SteinmetziteZn2Fe3+(PO4)2(OH) · 3H2OTric. 1 : P1
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.50KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
8.CA.55PushcharovskiteK0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1
8.CA.70ReaphookhilliteMgZn2(PO4)2 · 4H2OTric. 1 : P1
8.CA.75StergiouiteCaZn2(AsO4)2 · 4H2OMon. m : Pb
8.CA.80LimousiniteBaCa[Be4P4O16] · 6H2OMon. 2/m : P21/b
8.CA.85MinjiangiteBaBe2(PO4)2Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
8.CA.85Wilancookite(Ba5Li2◻)Ba6Be24P24O96 · 26H2OIso. 2 3 : I2 3

Other InformationHide

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

Internet Links for SelwyniteHide

References for SelwyniteHide

Localities for SelwyniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • Victoria
    • Buloke Shire
      • Wycheproof
CM 1995 +1 other reference
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