Classification of Pakhomovskyite |
| IMA status: | Approved 2004 |
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| Strunz 8th edition ID: | 7/C.13-42
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| 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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| mindat.org URL: | http://www.mindat.org/min-27472.html Please feel free to link to this page. |
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Type Occurrence of Pakhomovskyite |
| Type Locality: | Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia |
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| 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 |
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| Geological Setting of type material: | dolomite carbonatite cutting phosphorites |
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| Associated Minerals at type locality: | |
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Physical Properties of Pakhomovskyite |
| Lustre: | Pearly, Dull |
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| Diaphaneity (Transparency): | Translucent |
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| Colour: | Bright pink |
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| Streak: | Pink |
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| Hardness (Mohs): | 2 |
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| Tenacity: | Elastic |
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| Cleavage: | Perfect on {010} |
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| Fracture: | Step-Like |
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| Density (measured): | 2.71 g/cm3 |
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| Density (calculated): | 2.71 g/cm3 |
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Crystallography of Pakhomovskyite |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | B2/m {B1 1 2/m} {C2/m} {C1 2/m 1} |
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| Cell Parameters: | a = 10.034Å, b = 13.341Å, c = 4.67Å β = 105.02° |
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| Ratio: | a:b:c = 0.752 : 1 : 0.35 |
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| Unit Cell Volume: | V 603.8 ų |
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| Z: | 2 |
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| Morphology: | Groups of small spherulites (up to 0.5 mm diameter) and rosettes (up to 0.05 mm diameter) of well-shaped tabular crystals. |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 6.67 | | (100) | | 3.195 | | (60) | | 2.948 | | (70) | | 2.691 | | (70) | | 2.521 | | (60) |
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| Comments: | Format: dobs/Å (Iobs/%) (hkl),
from type description |
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Optical Data of Pakhomovskyite |
| Type: | Biaxial (+) |
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| RI values: | nα = 1.581 nβ = 1.600 nγ = 1.631 |
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| 2V: | Measured: 75° to 80°, Calculated: 77° |
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| Maximum Birefringence: | δ = 0.050
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Moderate |
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| Dispersion: | weak, r < v |
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| Pleochroism: | Visible |
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| Comments: | X = b, Y + c
pale pink on Y to pinkish grey on Z |
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Chemical Properties of Pakhomovskyite |
| Formula: | |
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| All elements listed in formula: | Co, H, O, P |
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| Analytical 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. % |
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| Empirical Formula: | | (Co | | Mg | | Mn | | Ni | | Fe | | )S2.99(PO | | ) | | · 8.35H | | O |
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| Common Impurities: | Mg,Mn,Ni,Fe |
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Relationship of Pakhomovskyite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Pakhomovskyite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Fluorescence in UV light: | None |
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| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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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 |
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Internet Links for Pakhomovskyite |
| Search Engines: |
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| External Links: | Look for Pakhomovskyite on WebmineralLook for Pakhomovskyite on Athena MineralogyLook for Pakhomovskyite on WikipediaLook for Pakhomovskyite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Pakhomovskyite in the Natural History Museum (London) online catalogue |
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Localities for Pakhomovskyite |
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality.
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