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Goedkenite

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Formula:
Sr2Al(PO4)2(OH)
May contain minor Ca replacing Sr.
Colour:
Colorless
Lustre:
Vitreous, Sub-Vitreous
Hardness:
5
Specific Gravity:
3.83 (Calculated)
Crystal System:
Monoclinic
Name:
Named in 1975 by Paul Brian Moore, Anthony J. Irving, and Anthony R. Kampf in honor of Virgil Linus Goedken [29 November 1940 Lamont, Buchanan County, Iowa, USA- 22 December 1992 Tallahassee, Leon County, Florida, USA]. Goedken was a researcher who made many important advances in the study of chemical bonding in organo-metallic structures.
Originally found as small (< 1 mm) colorless crystals growing epitaxially and perpendicularly on palermoite crystals.


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Classification of GoedkeniteHide

Approved
First Published:
1975
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

Physical Properties of GoedkeniteHide

Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless
Comment:
May be pale yellow due to staining
Streak:
White
Hardness:
Tenacity:
Brittle
Density:
3.83 g/cm3 (Calculated)

Optical Data of GoedkeniteHide

Type:
Biaxial (+)
RI values:
nα = 1.669 nβ = 1.673 nγ = 1.692
2V:
Measured: 45° to 50°, Calculated: 50°
Birefringence:
0.023
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
Pleochroism:
Non-pleochroic

Chemical Properties of GoedkeniteHide

Formula:
Sr2Al(PO4)2(OH)

May contain minor Ca replacing Sr.

Crystallography of GoedkeniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 8.45 Å, b = 5.74 Å, c = 7.26 Å
β = 113.7°
Ratio:
a:b:c = 1.472 : 1 : 1.265
Unit Cell V:
322.43 ų (Calculated from Unit Cell)
Z:
2

Epitaxial Relationships of GoedkeniteHide

Epitaxial Minerals:
Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.76 (50)
6.46 (30)
4.60 (10)
4.33 (40)
3.61 (10)
3.42 (40)
3.32 (30)
3.21 (20)
3.06 (100)
2.841 (60)
2.813 (40)
2.696 (20)
2.675 (30)
2.626 (10)
2.585 (70)
2.428 (30)
2.474 (20)
2.351 (20)
2.223 (10)
2.167 (40)
2.149 (30)
2.074 (30)
2.008 (40)
1.977 (20)
1.950 (20)
1.928 (20)
1.844 (20)
1.820 (20)
1.785 (30)
1.760 (10)
1.685 (20)
1.658 (10)
1.609 (50)
1.592 (30)
1.534 (20)
1.444 (10)
1.428 (30)
1.338 (10)
1.295 (30)
1.206 (20)
1.186 (20)
Comments:
ICDD 29-383

Occurrences of GoedkeniteHide

Paragenetic Mode(s):

Type Occurrence of GoedkeniteHide

Geological Setting of Type Material:
Found in late-stage phosphate mineralization in granite pegmatites. At the original occurrence, the host material was usually found in pods of siderite that had replaced triphylite giant crystals.
Associated Minerals at Type Locality:

Synonyms of GoedkeniteHide

Other Language Names for GoedkeniteHide

Relationship of Goedkenite to other SpeciesHide

Other Members of this group:
ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)Mon. 2/m : P21/m
GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
GrandaiteSr2Al(AsO4)2(OH)Mon. 2/m : P21/m
LombardoiteBa2Mn3+(AsO4)2(OH)Mon. 2/m : P21/m
TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
Unnamed (possible ordered As-analogue of Tokyoite)Ba2Mn[(As,V)O4]2(OH)Mon. 2/m : P21/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Palermoite17 photos of Goedkenite associated with Palermoite on mindat.org.
Hematite1 photo of Goedkenite associated with Hematite on mindat.org.
Quartz1 photo of Goedkenite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BG.05ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05UM1994-19-PO:CuHMoPbPb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH)
8.BG.05TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
8.BG.05FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
8.BG.05BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
8.BG.05TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.10MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
8.BG.15TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Dana Grouping (8th Ed.)Hide

41.10.4.2BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
41.10.4.3GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.5.1StrontiowhitlockiteSr9Mg(PO4)6(HPO4)Trig. 3m : R3c
19.5.2Belovite-(Ce)NaCeSr3(PO4)3FTrig. 3 : P3
19.5.3GoyaziteSrAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.5.5Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4Orth.
19.5.6NabaphiteNaBaPO4 · 9H2OIso.
19.5.7Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2Trig. 3m (3 2/m) : P3m1
19.5.8NastrophiteNa(Sr,Ba)PO4 · 9H2O
19.5.9JagoweriteBaAl2(PO4)2(OH)2Tric.
19.5.10GorceixiteBaAl3(PO4)(PO3OH)(OH)6Mon. m : Bm
19.5.11PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
19.5.12CuretoniteBa(Al,Ti)(PO4)(OH,O)FMon. 2/m
19.5.13Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3Mon.
19.5.14KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3Mon.
19.5.15PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m

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.

References for GoedkeniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 GoedkeniteHide

Localities for GoedkeniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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