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 - PrismaticH-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 · 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

Search for Pakhomovskyite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pakhomovskyite :

A Bijoux Google Search for Pakhomovskyite
Adam's Minerals Google Search for Pakhomovskyite
Cape Minerals Google Search for Pakhomovskyite
Dakota Matrix Minerals Google Search for Pakhomovskyite
Excalibur Mineral Corp. Google Search for Pakhomovskyite
Exceptional Minerals Google Search for Pakhomovskyite
John Betts Fine Minerals Search for Pakhomovskyite
McDougall Minerals Google Search for Pakhomovskyite
Mineral News Website Link
Rock and Mineral Shows Google Search for Pakhomovskyite
Weinrich Minerals, Inc. Google Search for Pakhomovskyite

Ask about Pakhomovskyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Pakhomovskyite Specimen Label here :

Pakhomovskyite

Co3(PO4)2•8(H2O)
Dana No: 40.03.06.09 Strunz No: 08.CE.40
Locality:

Notes: