Pakhomovskyite Mineral Data
General Pakhomovskyite Information
Chemical Formula:
Co3(PO4)2•8(H2O)
Composition:
Molecular Weight = 504.18 gm
Magnesium 1.83 % Mg 3.04 % MgO
Manganese 1.85 % Mn 2.39 % MnO
Iron 0.33 % Fe 0.43 % FeO
Cobalt 27.82 % Co 35.37 % CoO
Nickel 0.47 % Ni 0.59 % NiO
Phosphorus 12.35 % P 28.29 % P2 O5
Hydrogen 3.34 % H 29.84 % H2 O
Oxygen 52.01 % O
______ ______
100.00 % 99.95 % = TOTAL OXIDE
Empirical Formula:
Co2.38 Ni0.04 Fe2+ 0.03 (PO4 )2.01 •8.35(H2 O)Mg0.38 Mn2+ 0.17
Environment:
Found in leached fissures within dykes of dolomite carbonatite in the "Anomalous" ore of the Iron-Ore complex. Vivianite group
IMA Status:
Approved IMA 2004 (Dana # Added)
Locality:
Kovdor massif, Kola Peninsula, Russia Link to MinDat.org Location Data.
Name Origin:
Named for Yakov A. Pakhomovsky (b. 1948), a mineralogist of the Geological Institute of the Kola Science Center, Russian Academy of Sciences.
Synonym:
IMA2004-021
Pakhomovskyite Image
Images:
Pakhomovskyite
Comments: Pink crystals of pakhomovskyite on the matrix. (CanMin, v44:117).
Location: Dolomite carbonatite cutting phoscorites in the Iron-Ore Complex, Kovdor, Kola Peninsula, Russia.
Scale: See Image.
© Canadian Mineralogist
Images:
Pakhomovskyite
Comments: SEM image of crystals of pakhomovskyite on the matrix. (CanMin, v44:117).
Location: Dolomite carbonatite cutting phoscorites in the Iron-Ore Complex, Kovdor, Kola Peninsula, Russia.
Scale: See Image.
© Canadian Mineralogist
Pakhomovskyite Crystallography
Axial Ratios:
a:b:c =0.7521:1:0.35
Cell Dimensions:
a = 10.034, b = 13.341, c = 4.67, Z = 2; beta = 105.02° V = 603.79 Den(Calc)= 2.77
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 6.67(1), 2.691(0.7), 2.948(0.7), 3.195(0.7), 2.408(0.6), 2.521(0.6), 3.84(0.4), 4.85(0.4),
Physical Properties of Pakhomovskyite
Color:
Bright pink.
Density:
2.71
Diaphaneity:
Translucent to transparent
Fracture:
Flexible - Flexible fragments.
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
2 - Gypsum
Luster:
Pearly
Streak:
pink
Optical Properties of Pakhomovskyite
Gladstone-Dale:
CI meas = 0.027 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = 0.049 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2181,KPDmeas = 0.2229,KC = 0.2292 Ncalc = 1.62 - 1.63
Optical Data:
Biaxial (+), a=1.581, b=1.6, g=1.631, bire=0.0500
Calculated Properties of Pakhomovskyite
Electron Density:
Bulk Density (Electron Density)=2.72 gm/cc note: Specific Gravity of Pakhomovskyite =2.71 gm/cc.
Fermion Index:
Fermion Index = 0.0022095942 Boson Index = 0.9977904058
Photoelectric:
PEPakhomovskyite = 10.54 barns/electronU=PEPakhomovskyite x r Electron Density= 28.65 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pakhomovskyite is Not Radioactive
Pakhomovskyite Classification
Dana Class:
40.03.06.09 (40) Hydrated Phosphates, etc
(40.03) where (A++)3 (XO4)2 � x(H2O)
(40.03.06) Vivianite Group
40.03.06.01 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
40.03.06.02 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
40.03.06.03 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.04 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.05 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
40.03.06.06 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
40.03.06.07 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
40.03.06.08 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
40.03.06.09 Pakhomovskyite ! Co3(PO4)2•8(H2O) C 2/m 2/m
Strunz Class:
08.CE.40 08 - PHOSPHATES, ARSENATES, VANADATES
08.C - Phosphates without Additional Anions, with H2O
08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.40 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
08.CE.40 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
08.CE.40 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None
08.CE.40 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
08.CE.40 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
08.CE.40 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21 /c 2/m
08.CE.40 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
08.CE.40 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
08.CE.40 Pakhomovskyite ! Co3(PO4)2•8(H2O) C 2/m 2/m
Other Pakhomovskyite Information
References:
NAME( AmMin, v91, p1948) PHYS. PROP.(AmMin, v91, p1948) OPTIC PROP.(AmMin, v91, p1948)
See Also:
Links to other databases for Pakhomovskyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Pakhomovskyite
Co3(PO4)2•8(H2O)
Dana No: 40.03.06.09 Strunz No: 08.CE.40
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