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Pakhomovskyite

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About PakhomovskyiteHide

Formula:
Co3(PO4)2 · 8H2O
Colour:
Bright pink
Lustre:
Pearly, Dull
Hardness:
2
Specific Gravity:
2.71
Crystal System:
Monoclinic
Member of:
Name:
Named for Yakov A. Pakhomovsky (1948-), who made significant contributions to the mineralogy of the alkaline massifs of the Kola Peninsula
This page provides mineralogical data about Pakhomovskyite.


Classification of PakhomovskyiteHide

Approved
Approval Year:
2004
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

Physical Properties of PakhomovskyiteHide

Pearly, Dull
Transparency:
Translucent
Colour:
Bright pink
Streak:
Pink
Hardness:
Tenacity:
Elastic
Cleavage:
Perfect
on {010}
Fracture:
Step-Like
Density:
2.71 g/cm3 (Measured)    2.71 g/cm3 (Calculated)

Optical Data of PakhomovskyiteHide

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

Formula:
Co3(PO4)2 · 8H2O
Common Impurities:
Mg,Mn,Ni,Fe

Crystallography of PakhomovskyiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 10.034 Å, b = 13.341 Å, c = 4.67 Å
β = 105.02°
Ratio:
a:b:c = 0.752 : 1 : 0.35
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.67 (100)
3.195 (60)
2.948 (70)
2.691 (70)
2.521 (60)
2.408 (60)
Comments:
Format: dobs/Å (Iobs/%) (hkl),
from type description

Type Occurrence of PakhomovskyiteHide

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:

Synonyms of PakhomovskyiteHide

Other Language Names for PakhomovskyiteHide

Simplified Chinese:水磷钴石
Traditional Chinese:水磷鈷石

Relationship of Pakhomovskyite to other SpeciesHide

Member of:
Other Members of this group:
AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
BabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Fluorescence of PakhomovskyiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for PakhomovskyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 PakhomovskyiteHide

Localities for PakhomovskyiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmanskaya Oblast'
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
Yakovenchuk V N, Ivanyuk G Y, Mikhailova Y A, Selivanova E A, Krivovichev S V (2006) Pakhomovskyite, Co3(PO4)2·8H2O, a new mineral species from Kovdor, Kola Peninsula, Russia, The Canadian Mineralogist 44, 117-123
Mikhailova, J. A., Kalashnikov, A. O., Sokharev, V. A., Pakhomovsky, Y. A., Konopleva, N. G., Yakovenchuk, V. N., ... & Ivanyuk, G. Y. (2016). 3D mineralogical mapping of the Kovdor phoscorite–carbonatite complex (Russia). Mineralium Deposita, 51(1), 131-149.
Mineral and/or Locality  
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