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 % P₂O₅

Hydrogen 3.34 % H 29.84 % H₂O

Oxygen 52.01 % O

______ ______

100.00 % 99.95 % = TOTAL OXIDE

Empirical Formula:

Co_2.38Ni_0.04Fe²⁺_0.03(PO₄)_2.01•8.35(H₂O)Mg_0.38Mn²⁺_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

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

By Intensity(I/I_o): 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:

PE_{Pakhomovskyite}= 10.54 barns/electron
U=PE_{Pakhomovskyite} x rElectron 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 ï¿½ 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 ï¿½ 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
Locality:

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