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Pakhomovskyite

Formula:
Co
 
3
[PO
 
4
]
 
2
 · 8H
 
2
O
System:MonoclinicColour:Bright pink
Hardness:2
Name:Named for Yakov A. Pakhomovsky, who made significant contributions to the mineralogy of the alkaline massifs of the Kola Peninsula


Vivianite Group

Classification of Pakhomovskyite

IMA status:Approved 2004
Strunz 8th edition ID:7/C.13-42
Nickel-Strunz 10th (pending) edition ID:8.CE.40

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
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Type Occurrence of Pakhomovskyite

Type Locality:Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:groups (up to 3 x 3 x 2 cm) of small spherulites (up to 0.5 mm diameter) and rosettes (up to 0.05 mm diameter) of tabular crystals, growing on walls of leached fissures in dolomitic carbonatite
Geological Setting of type material:dolomite carbonatite cutting phosphorites
Associated Minerals at type locality:
RimkorolgitePyrrhotitePyritePhlogopiteNorsethite
MagnetiteKovdorskiteJuonniiteChalcopyriteBobierrite
Bakhchisaraitsevite

Physical Properties of Pakhomovskyite

Lustre:Pearly, Dull
Diaphaneity (Transparency):Translucent
Colour:Bright pink
Streak:Pink
Hardness (Mohs):2
Tenacity:Elastic
Cleavage:Perfect
on {010}
Fracture:Step-Like
Density (measured):2.71 g/cm3
Density (calculated):2.71 g/cm3

Crystallography of Pakhomovskyite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m (B1 1 2/m) [C2/m] {C1 2/m 1}
Cell Parameters:a = 10.034Å, b = 13.341Å, c = 4.67Å
β = 105.02°
Ratio:a:b:c = 0.752 : 1 : 0.35
Unit Cell Volume:V 603.8 ų
Z:2
Morphology:Groups of small spherulites (up to 0.5 mm diameter) and rosettes (up to 0.05 mm diameter) of well-shaped tabular crystals.
X-Ray Powder Diffraction:
d-spacingIntensity
6.67 (100)
3.195 (60)
2.948 (70)
2.691 (70)
2.521 (60)
Comments:Format: dobs/Å (Iobs/%) (hkl),
from type description

Optical Data of Pakhomovskyite

Type:Biaxial (+)
RI values: nα = 1.581 nβ = 1.600 nγ = 1.631
2V:Measured: 75° to 80°, Calculated: 77°
Maximum Birefringence:δ = 0.050

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:weak, r < v
Pleochroism:Visible
Comments:X = b, Y + c
pale pink on Y to pinkish grey on Z

Chemical Properties of Pakhomovskyite

Formula:
Co
 
3
[PO
 
4
]
 
2
 · 8H
 
2
O
Essential elements:
All elements listed in formula:Co, H, O, P
Analyical Data:Results from electron microprobe analysis, water determined by Penfield's method
The empirical formula was calculated on the basis of 5 atoms and ions, respectively, of Co, Mg, Mn, Ni, Fe and P
CoO (34.88)
MgO (2.97)
MnO (2.41)
FeO (0.40)
NiO (0.53)
P2O5 (27.95)
H2O (29.50)

total 98.64 wt. %
Empirical Formula:
(Co
 
2.38
Mg
 
0.38
Mn
 
0.17
Ni
 
0.04
Fe
2+
0.03
)S2.99(PO
 
4
)
 
2.01
 · 8.35H
 
2
O
Common Impurities:Mg,Mn,Ni,Fe

Relationship of Pakhomovskyite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.CE.05Chudobaite
(Na,K)(Mg,Zn)
 
2
H(AsO
 
4
)(OH,O)
 
6
8.CE.05Geigerite
Mn
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.10Newberyite
MgHPO
 
4
·3H
 
2
O
8.CE.15Brassite
MgHAsO
 
4
·4H
 
2
O
8.CE.20Phosphorrösslerite
MgHPO
 
4
·7H
 
2
O
8.CE.20Rösslerite
MgHAsO
 
4
·7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-9H
 
2
O
8.CE.30IMA2005-053
(Zn,Cu,Co)Cu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·9H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
·22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
[PO
 
4
] · 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
·3.5H
 
2
O
8.CE.65Steigerite
AlVO
 
4
·3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
PO
 
4
VO
 
4
·6H
 
2
O
8.CE.70Schoderite
Al
 
2
PO
 
4
VO
 
4
·8H
 
2
O
8.CE.75Mahlmoodite
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
·4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
·8(H
 
2
O,OH)
8.CE.85Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x·(8-x)H
 
2
O

Other Names for Pakhomovskyite

Synonyms:
IMA2004-021

Other Information

Fluorescence in UV light:None
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 Pakhomovskyite

Reference List:Yakovenchuk, V.N., Ivanyuk, G.Yu., Mikhailova, Yu, A., Selivanova, E.A., Krivovichev, S.V. (2006): Pakhomovskyite, Co3(PO4)2·8H2O, a new mineral species from Kovdor, Kola Peninsula, Russia. Canadian Mineralogist 44:117-123

Internet Links for Pakhomovskyite

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    Localities for Pakhomovskyite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		Yakovenchuk, V.N., Ivanyuk, G.Yu., Mikhailova, Yu, A., Selivanova, E.A., Krivovichev, S.V. (2006): Pakhomovskyite, Co3(PO4)2·8H2O, a new mineral species from Kovdor, Kola Peninsula, Russia. Canadian Mineralogist 44:117-123
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