Goedkenite Mineral Data

General Goedkenite Information

Chemical Formula:

(Sr,Ca)2Al(PO4)2(OH)

Composition:

Molecular Weight = 385.40 gm

Strontium 34.10 % Sr 40.33 % SrO

Calcium 5.20 % Ca 7.28 % CaO

Aluminum 7.00 % Al 13.23 % Al₂O₃

Phosphorus 16.07 % P 36.83 % P₂O₅

Hydrogen 0.26 % H 2.34 % H₂O

Oxygen 37.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_1.5Ca_0.5Al(PO₄)₂(OH)

IMA Status:

Approved IMA 1975

Locality:

Palermo pegmatite, North Groton, Grafton County, New Hampshire, USA Link to MinDat.org Location Data.

Name Origin:

Named for V. L. Goedken.

Name Pronunciation:

Goedkenite + Pronunciation

Goedkenite Image

Images:

Goedkenite

Comments: Clear, pointed goedkenite crystals epitaxially overgrown on palermoite.
Location: Palermo #1 mine, North Groton, Grafton County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Goedkenite Crystallography

Axial Ratios:

a:b:c =1.4721:1:1.2648

Cell Dimensions:

a = 8.45, b = 5.74, c = 7.26, Z = 2; beta = 113.7° V = 322.43 Den(Calc)= 3.97

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.061(1), 2.585(0.7), 2.841(0.6),

Physical Properties of Goedkenite

Cleavage:

{100} Good

Color:

Colorless, Light yellow.

Density:

3.83

Diaphaneity:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Goedkenite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1708,KPDmeas= 0.177,KC= 0.1765
Ncalc = 1.68 - 1.7

Optical Data:

Biaxial (+), a=1.669, b=1.673, g=1.692, bire=0.0230, 2V(Calc)=50, 2V(Meas)=45-50.

Calculated Properties of Goedkenite

Electron Density:

Bulk Density (Electron Density)=3.64 gm/cc
note: Specific Gravity of Goedkenite =3.83 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Goedkenite= 39.61 barns/electron
U=PE_Goedkenite x rElectron Density= 144.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Goedkenite is Not Radioactive

Goedkenite Classification

Dana Class:

41.10.04.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.04)Goedkenite Group

41.10.04.01 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

41.10.04.02 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

41.10.04.03 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

41.10.04.04 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Strunz Class:

08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1

08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 2₁/m 2/m

08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 2₁,P 2₁/m Mono

08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Other Goedkenite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Goedkenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Goedkenite

(Sr,Ca)2Al(PO4)2(OH)
Dana No: 41.10.04.01 Strunz No: 08.BG.05
Locality:

Notes:

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