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Feodosiyite

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About FeodosiyiteHide

Feodosiy N. Chernyshev
Formula:
Cu11Mg2Cl18(OH)8·16H2O
Colour:
Bright green
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.57
Crystal System:
Monoclinic
Name:
Named in honor of Feodosiy Nikolaevich Chernyshev (Феодосий Николаевич Чернышёв) (24 September [O.S. 12 September] 1856, Kiev – 15 January [O.S. 2 January] 1914), Russian geologist and paleontologist. He conducted fieldwork and made significant contributions to the Paleozoic deposits of the Urals. Several geographical features are also named after him.
New structure type.

Chemially similar to haydeeite, paratacamite-(Mg) and tondiite.


Classification of FeodosiyiteHide

Approved
Approval Year:
2015
First Published:
2018

Physical Properties of FeodosiyiteHide

Vitreous
Transparency:
Transparent
Colour:
Bright green
Hardness:
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fracture:
Irregular/Uneven
Density:
2.57 g/cm3 (Measured)    2.563 g/cm3 (Calculated)

Optical Data of FeodosiyiteHide

Type:
Biaxial (-)
RI values:
nα = 1.660 nβ = 1.690 nγ = 1.718
2V:
Measured: 90° (5)
Max Birefringence:
δ = 0.058
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of FeodosiyiteHide

Formula:
Cu11Mg2Cl18(OH)8·16H2O
IMA Formula:
Cu11Mg2Cl18(OH)8 · 16H2O

Crystallography of FeodosiyiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 12.9010(6) Å, b = 16.4193(5) Å, c = 11.9614(5) Å
β = 113.691(6)°
Ratio:
a:b:c = 0.786 : 1 : 0.728
Unit Cell V:
2320.2 ų
Z:
2
Morphology:
Tabular or prismatic crystals up to 0.02 × 0.1 × 0.1 mm3 combined in interrupted incrustations up to 0.1 × 0.5 × 1 cm3.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.87 (100)
6.585 (15)
5.969 (25)
5.905 (16)
5.231 (13)
5.183 (6)
3.135 (8)
2.924 (11)

Occurrences of FeodosiyiteHide

Paragenetic Mode(s):
•  Fumarolic

Type Occurrence of FeodosiyiteHide

General Appearance of Type Material:
Tabular or prismatic crystals to 0.1 mm, combined in interrupted incrustations overgrowing basalt scoria.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4723/1
Empirical Formula of Type Material:
Cu10.58Mg2.40Cl17.90(OH)8.06·16.04H2O
Chemical Analysis of Type Material:
MgO5.39 %
Cu46.98 %
Cl35.42 %
H2O calc20.21 %
–O = Cl-8.00 %
Total:100 %
Geological Setting of Type Material:
Fumarole
Associated Minerals at Type Locality:
Reference:
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Ksenofontov, D.A., Britvin, S.N., Sidorov, E.G., Khanin, D.A., Pushcharovsky, D.Yu. (2018) Feodosiyite, Cu11Mg2Cl18(OH)8·16H2O, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Neues Jahrbuch für Mineralogie - Abhandlungen: 195: 27-39.

Synonyms of FeodosiyiteHide

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 FeodosiyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Britvin, S.N., Sidorov, E.G., Pushcharovsky, D.Y. (2015) Feodosiyite, IMA 2015-063. CNMNC Newsletter No. 28, December 2015, page 1860; Mineralogical Magazine: 79: 1859–1864.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Ksenofontov, D.A., Britvin, S.N., Sidorov, E.G., Khanin, D.A., Pushcharovsky, D.Yu. (2018) Feodosiyite, Cu11Mg2Cl18(OH)8·16H2O, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Neues Jahrbuch für Mineralogie - Abhandlungen: 195: 27-39.

Internet Links for FeodosiyiteHide

Localities for FeodosiyiteHide

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)
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Britvin, S.N., Sidorov, E.G. and Pushcharovsky, D.Y. (2015) Feodosiyite, IMA 2015-063. CNMNC Newsletter No. 28, December 2015, page 1860; Mineralogical Magazine, 79, 1859–1864. ; Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Lykova, I.S., Vigasina, M.F., Ksenofontov, D.A., Britvin, S.N., Sidorov, E.G., Khanin, D.A., Pushcharovsky, D.Yu. (2018): Feodosiyite, Cu11Mg2Cl18(OH)8·16H2O, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Neues Jahrbuch für Mineralogie - Abhandlungen, 195, 27-39
Mineral and/or Locality  
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