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Goedkenite

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Formula:
Sr2Al(PO4)2(OH)
May contain minor Ca replacing Sr.
System:
Monoclinic
Hardness:
5
This page provides mineralogical data about Goedkenite.

Classification of Goedkenite

Approved
8.BG.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
41.10.4.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
10 : (AB)3(XO4)2Zq
19.5.4

19 : Phosphates
5 : Phosphates of Sr and Ba
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Type Occurrence of Goedkenite

Year of Discovery:
1975

Physical Properties of Goedkenite

Hardness (Mohs):
5

Crystallography of Goedkenite

Crystal System:
Monoclinic
Cell Parameters:
a = 8.45Å, b = 5.74Å, c = 7.26Å
β = 113.7°
Ratio:
a:b:c = 1.472 : 1 : 1.265
Unit Cell Volume:
V 322.43 ų (Calculated from Unit Cell)

Optical Data of Goedkenite

Type:
Biaxial (+)
RI values:
nα = 1.669 nβ = 1.673 nγ = 1.692
2V:
Measured: 45° to 50°, Calculated: 50°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v or r < v

Chemical Properties of Goedkenite

Formula:
Sr2Al(PO4)2(OH)

May contain minor Ca replacing Sr.
Essential elements:
All elements listed in formula:

Relationship of Goedkenite to other Species

Other Members of Group:
ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)
ArsentsumebitePb2Cu(AsO4)(SO4)(OH)
BearthiteCa2Al(PO4)2(OH)
BrackebuschitePb2Mn3+(VO4)2(OH)
BushmakinitePb2Al(PO4)(VO4)(OH)
CalderónitePb2Fe3+(VO4)2(OH)
FeinglositePb2Zn(AsO4)2 · H2O
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)
GamagariteBa2Fe3+(VO4)2(OH)
GrandaiteSr2Al(AsO4)2(OH)
TokyoiteBa2Mn3+(VO4)2(OH)
TsumebitePb2Cu(PO4)(SO4)(OH)
8.BG.05ArsentsumebitePb2Cu(AsO4)(SO4)(OH)
8.BG.05BearthiteCa2Al(PO4)2(OH)
8.BG.05BrackebuschitePb2Mn3+(VO4)2(OH)
8.BG.05GamagariteBa2Fe3+(VO4)2(OH)
8.BG.05UM1994-19-PO:CuHMoPbPb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH)
8.BG.05TsumebitePb2Cu(PO4)(SO4)(OH)
8.BG.05ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)
8.BG.05FeinglositePb2Zn(AsO4)2 · H2O
8.BG.05BushmakinitePb2Al(PO4)(VO4)(OH)
8.BG.05TokyoiteBa2Mn3+(VO4)2(OH)
8.BG.05CalderónitePb2Fe3+(VO4)2(OH)
8.BG.10MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
8.BG.15TancoiteLiNa2Al(PO4)(HPO4)(OH)
19.5.1StrontiowhitlockiteSr9Mg(PO4)6(HPO4)
19.5.2Belovite-(Ce)NaCeSr3(PO4)3F
19.5.3GoyaziteSrAl3(PO4)(PO3OH)(OH)6
19.5.5Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4
19.5.6NabaphiteNaBaPO4 · 9H2O
19.5.7Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2
19.5.8NastrophiteNa(Sr,Ba)PO4 · 9H2O
19.5.9JagoweriteBaAl2(PO4)2(OH)2
19.5.10GorceixiteBaAl3(PO4)(PO3OH)(OH)6
19.5.11PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3
19.5.12CuretoniteBa(Al,Ti)(PO4)(OH,O)F
19.5.13Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3
19.5.14KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3
19.5.15PerloffiteBa(Mn2+,Fe2+)2Fe23+(PO4)3(OH)3

Other Names for Goedkenite

Name in Other Languages:

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 Goedkenite

Reference List:
Moore, P. B., Irving, A. J. and Kampf, A. R. (1975): Foggite, CaAl(OH)2(H2O)[PO4]; goedkenite, (Sr,Ca)2Al(OH)[PO4]2; and samuelsonite, (Ca,Ba)Fe22+Mn22+Ca8Al2(OH)2[PO4]10. Three new species from the Palermo No. 1 pegmatite, North Groton, New Hampshire. American Mineraleralogist: 60, 957-964.

Internet Links for Goedkenite

Localities for Goedkenite

(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.
Slovakia
 
  • Nitra Region
    • Nitra Co.
      • Nitra
Uher P., Mikuš T., Milovský R., Biroň A., Spišiak J., Lipka J., Jahn J. (2009): Lazulite and Ba, Sr, Ca, K-rich phosphates-sulphates in quartz veins from metaquartzites of Tribeč Mountains, Western Carpathians, Slovakia: Compositional variations and evolution. Lithos, 112, 447-460.
    • Zlaté Moravce Co.
Uher P., Mikuš T., Milovský R., Biroň A., Spišiak J., Lipka J., Jahn J. (2009): Lazulite and Ba, Sr, Ca, K-rich phosphates-sulphates in quartz veins from metaquartzites of Tribeč Mountains, Western Carpathians, Slovakia: Compositional variations and evolution. Lithos, 112, 447-460.
USA (TL)
 
  • New Hampshire
    • Grafton Co.
      • Groton
Amer.Min.(1975) 60, 957-964
Mineral and/or Locality  
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