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Epifanovite

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P. P. Epifanov
Formula:
NaCaCu5(PO4)4[AsO2(OH)2]·7H2O
Colour:
Turquoise blue
Lustre:
Vitreous, Dull
Hardness:
3
Specific Gravity:
3.65
Crystal System:
Monoclinic
Name:
The mineral is named in honor of P. P. Epifanov, Russian geologist and the discoverer of the Kester tin deposit.
The third known mineral to contain phosphate and arsenate (actually dihydroxoarsenate(V)) at separate structural positions (i.e., not substituting for each other) after machatschkiite and walentaite. Considering this separation, the chemical combination in epifanovite is unique among the known (accepted) minerals.

Related to sampleite and andyrobertsite. It may be considered as a more hydrated dihydroxoarsenate equivalent of sampleite.

Epifanovite is structurally close to lavendulan-group minerals and related species: andyrobertsite, calcioandyrobertsite, mahnertite and richelsdorfite




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Classification of EpifanoviteHide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of EpifanoviteHide

Vitreous, Dull
Transparency:
Transparent
Comment:
Dull in crusts
Colour:
Turquoise blue
Streak:
Pale blue
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on (001) and good on (100) and (010)
Density:
3.65(3) g/cm3 (Measured)    3.73 g/cm3 (Calculated)

Optical Data of EpifanoviteHide

Type:
Biaxial (-)
RI values:
nα = 1.708(5) nβ = 1.730(5) nγ = 1.735(5)
2V:
Measured: 40° to 45°, Calculated: 50°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of EpifanoviteHide

Formula:
NaCaCu5(PO4)4[AsO2(OH)2]·7H2O
IMA Formula:
NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O

Crystallography of EpifanoviteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 9.6911(8) Å, b = 9.7547(9) Å, c = 9.963(1) Å
β = 102.24(1)°
Ratio:
a:b:c = 0.993 : 1 : 1.021
Unit Cell V:
920.43 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular pseudotetragonal crystals up to 50 μm across and 10 μm thick.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.73(100)
6.79(35)
4.355(12)
3.072(43)
3.061(24)
3.003(24)
2.698(11)
2.405(10)

Occurrences of EpifanoviteHide

Paragenetic Mode(s):
•  Oxidation

Type Occurrence of EpifanoviteHide

General Appearance of Type Material:
Crusts of tabular pseudo-tetragonal crystals up to 50 µm across and 10 μm thick.
Place of Conservation of Type Material:
Collections of the Mineralogical Museum of the St. Petersburg State University, Russia (catalogue No. 19658/1)
Empirical Formula of Type Material:
(Na0.94K0.061.00Ca0.82Na0.080.90(Cu5.04Zn0.065.10(PO4)4[(As0.81P0.191.00(O1.92OH2.06Cl0.024.00]7.37H2O
Geological Setting of Type Material:
It was found in a quartz-phosphate nest within greisenized cassiterite-rich grano-diorite of the Kester tin deposit
Associated Minerals at Type Locality:
Reference:
Yakovenchuk, V.N., Pakhomovsky, Ya.A., Konoplyova, N.G., Panikorovskii, T.L., Mikhailova, Yu.A., Bocharov, V.N., Krivovichev, S.V., Ivanyuk, G.Yu. (2017): Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2]·7H2O a new mineral from the Këster deposit (Sakha-Yakutia, Russia). Zapiski RMO: 146 (3) : 30-38.

Synonyms of EpifanoviteHide

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 EpifanoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yakovenchuk, V.N., Pakhomovsky, Y.A., Konoplyova, N.G., Panikirovskii, T.L., Mikhailova, J.A., Bocharov, V.N., Krivovichev, S.V., Ivanyuk, G.Y. (2016) Epifanovite, IMA 2016-063. CNMNC Newsletter No. 34, December 2016, page 1316. Mineralogical Magazine: 80: 1315–1321.
Yakovenchuk, V.N., Pakhomovsky, Ya.A., Konoplyova, N.G., Panikorovskii, T.L., Mikhailova, Yu.A., Bocharov, V.N., Krivovichev, S.V., Ivanyuk, G.Yu. (2017) Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2]·7H2O a new mineral from the Këster deposit (Sakha-Yakutia, Russia). Zapiski RMO: 146(3): 30-38.
Яковенчук, В. Н., Пахомовский, Я. А., Коноплева, Н. Г., Паникоровский, Т. Л., Михайлова, Ю. А., Бочаров, В. Н., ... & Иванюк, Г. Ю. (2017) ЕПИФАНОВИТ NaCaCu5(PO 4)4[AsO2(OH)2]*7H2O -НОВЫЙ МИНЕРАЛ ИЗ МЕСТОРОЖДЕНИЯ КЕСТЁР (САХА-ЯКУТИЯ, РОССИЯ). Записки Российского минералогического общества: 146(3): 30-39.

Internet Links for EpifanoviteHide

Localities for EpifanoviteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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)
 
  • Eastern-Siberian Region
    • Sakha Republic (Yakutia)
      • Verkhoyansk
        • Yana River Basin
          • Yana-Adycha Region
            • Arga-Ynnakh-Khaya granite Massif
Yakovenchuk, V.N., Pakhomovsky, Y.A., Konoplyova, N.G., Panikirovskii, T.L., Mikhailova, J.A., Bocharov, V.N., Krivovichev, S.V. and Ivanyuk, G.Y. (2016) Epifanovite, IMA 2016-063. CNMNC Newsletter No. 34, December 2016, page 1316; Mineralogical Magazine, 80, 1315–1321; Yakovenchuk, V.N., Pakhomovsky, Ya.A., Konoplyova, N.G., Panikorovskii, T.L., Mikhailova, Yu.A., Bocharov, V.N., Krivovichev, S.V., Ivanyuk, G.Yu. (2017): Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2]·7H2O a new mineral from the Këster deposit (Sakha-Yakutia, Russia). Zapiski RMO, 146(3), 30-38.; Yakovenchuk, V. N., Pakhomovsky, Y. A., Konopleva, N. G., Panikorovskii, T. L., Bazai, A., Mikhailova, J. A., ... & Krivovichev, S. V. (2018). Batagayite, CaZn 2 (Zn, Cu) 6 (PO 4) 4 (PO 3 OH) 3· 12H 2 O, a new phosphate mineral from Këster tin deposit (Yakutia, Russia): occurrence and crystal structure. Mineralogy and Petrology, 1-11.
Mineral and/or Locality  
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