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Goedkenite

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Formula:
Sr2Al(PO4)2(OH)
May contain minor Ca replacing Sr.
System:
Monoclinic
Colour:
Colorless
Lustre:
Vitreous, Sub-Vitreous
Hardness:
5
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.


Classification of Goedkenite

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 Goedkenite

Vitreous, Sub-Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Comment:
May be pale yellow due to staining
Streak:
White
Hardness (Mohs):
5
Tenacity:
Brittle
Density:
3.83 g/cm3 (Calculated)

Optical Data of Goedkenite

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 Goedkenite

Formula:
Sr2Al(PO4)2(OH)

May contain minor Ca replacing Sr.
Elements listed in formula:

Crystallography of Goedkenite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Space Group 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 Volume:
V 322.43 ų (Calculated from Unit Cell)
Z:
2

Epitaxial Relationships of Goedkenite

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

Paragenetic Mode(s):

Type Occurrence of Goedkenite

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.

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)
CanosioiteBa2Fe3+(AsO4)2(OH)
FeinglositePb2Zn(AsO4)2 · H2O
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)
GamagariteBa2Fe3+(VO4)2(OH)
GrandaiteSr2Al(AsO4)2(OH)
LombardoiteBa2Mn3+(AsO4)2(OH)
TokyoiteBa2Mn3+(VO4)2(OH)
TsumebitePb2Cu(PO4)(SO4)(OH)
Unnamed (possible ordered As-analogue of Tokyoite)Ba2Mn[(As,V)O4]2(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

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https://www.mindat.org/min-1718.html
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Localities for Goedkenite

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.
(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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