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Goedkenite

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Palermo No. 1 Mine (Palermo #1 pegmatite), Groton, Grafton Co., New Hampshire, USA
© Dick Dionne

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Formula:
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
System:MonoclinicHardness:5
Member of:Brackebuschite Group
This page provides mineralogical data about Goedkenite.

Classification of Goedkenite

IMA status:Approved
Strunz 8th edition ID:7/B.24-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.10.4.1

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

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

Type Locality:Palermo No. 1 Mine (Palermo #1 pegmatite), Groton, Grafton Co., New Hampshire, USA
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°
Maximum Birefringence:δ = 0.023

Chart 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:
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
Essential elements:Al, H, O, P, Sr
All elements listed in formula:Al, Ca, H, O, P, Sr

Relationship of Goedkenite to other Species

Member of:Brackebuschite Group
Other Members of Group:

- +
Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)
Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
Cu(PO
 
4
)(MoO
 
4
,AsO
 
4
,CrO
 
4
,GaO
 
4
)(OH)
8.BG.05Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
8.BG.05Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
8.BG.05Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
(PO
 
4
)
 
2
(OH)
8.BG.15Tancoite
LiNa
 
2
Al(PO
 
4
)(HPO
 
4
)(OH)
Related Minerals - Hey's Index Grouping:

- +
19.5.1Strontiowhitlockite
Sr
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
19.5.2Belovite-(Ce)
NaCeSr
 
3
(PO
 
4
)
 
3
F
19.5.3Goyazite
SrAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.5.5Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
(PO
 
4
)
 
4
(OH)
 
4
19.5.6Nabaphite
NaBaPO
 
4
 · 9H
 
2
O
19.5.7Olgite
(Sr,Ba)(Na,Sr,REE)
 
2
Na(PO
 
4
)
 
2
19.5.8Nastrophite
Na(Sr,Ba)PO
 
4
 · 9H
 
2
O
19.5.9Jagowerite
BaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
19.5.10Gorceixite
BaAl
 
3
(PO
 
4
)
 
2
(OH)
 
5
 · H
 
2
O
19.5.11Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
19.5.12Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
19.5.13Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
19.5.14Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3
19.5.15Perloffite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3

Other Names for Goedkenite

Synonyms:
IMA1974-004
Other Languages:
German:Goedkenit
Russian:Гоудкенит
Spanish:Goedkenita

Other Information

Health Warning: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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    • Localities for Goedkenite

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    (TL) indicates type locality. ? 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.
    USA
     
    • New Hampshire
      • Grafton Co.
        • Groton
    		Amer.Min.(1975) 60, 957-964
    Mineral and/or Locality
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