IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Melkovite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About MelkoviteHide

Vyacheslav Gavrilovich Melkov
Formula:
[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]
Colour:
Brownish yellow; lemon yellow
Lustre:
Waxy, Dull
Hardness:
3
Specific Gravity:
2.969 - 2.973
Crystal System:
Monoclinic
Name:
First described from a U-Mo deposit, Shunak Mts, Kazakhstan by Yegorov et al. (1969). Named in honour of Professor Vyacheslav Gavrilovich Melkov (1911–1991), Russian mineralogist specializing in uranium minerals, of the All-Union Research Institute of Mineral Resources, Moscow, Russia.

The mineral vyacheslavite is also named in his honor.

Classification of MelkoviteHide

Approved
First Published:
1969
8.DM.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1
49.4.3.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
22.5.11

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

Physical Properties of MelkoviteHide

Waxy, Dull
Transparency:
Transparent
Colour:
Brownish yellow; lemon yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
One perfect cleavage
Density:
2.969 - 2.973 g/cm3 (Measured)    2.851 g/cm3 (Calculated)

Optical Data of MelkoviteHide

Type:
Biaxial
Dispersion:
strong
Pleochroism:
Weak
Comments:
Colourless to light green

Chemical Properties of MelkoviteHide

Formula:
[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]
IMA Formula:
CaFe3+2Mo5O10(PO4)2(OH)12 · 8H2O

Crystallography of MelkoviteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.81(9) Å, b = 10.99(10) Å, c = 15.11(9) Å
β = 129.6(2)°
Ratio:
a:b:c = 1.712 : 1 : 1.375
Unit Cell V:
2407 ų

Type Occurrence of MelkoviteHide

General Appearance of Type Material:
Finely crystalline powdery films and veinlets consisting of platy crystals generally 0.001-0.002 mm in diameter.
Place of Conservation of Type Material:
Mineralogical Museum Acad. Sci. USSR, Moscow.
Geological Setting of Type Material:
Oxidation zone of a molybdenite-fluorite deposit.
Associated Minerals at Type Locality:

Synonyms of MelkoviteHide

Other Language Names for MelkoviteHide

German:Melkovit
Spanish:Melkovita

Relationship of Melkovite to other SpeciesHide

Other Members of this group:
Mendozavilite-KCa[K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3] Mon. 2/m : B2/m
Mendozavilite-NaCu[Na2(H2O)15Cu(H2O)6][Mo8P2Fe3+3O34(OH)3] Mon. 2/m : B2/m
Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m

Related Minerals - Nickel-Strunz GroupingHide

8.DM.Betpakdalite-CaMg[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] Mon. 2/m : B2/m
8.DM.Betpakdalite-FeFe[Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3 O37]Mon. 2/m : B2/m
8.DM.05MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m
8.DM.05EsperanzaiteNaCa2Al2(AsO4)2(OH)F4 · 2H2OMon.
8.DM.10ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
8.DM.10TyroliteCa2Cu9(AsO4)4(CO3)(OH)8 · 11H2OMon. 2/m
8.DM.15Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
8.DM.15Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
8.DM.20Phosphovanadylite-BaBa[V4+4P2O8(OH)8]·12H2OIso.
8.DM.20Phosphovanadylite-CaCa[V4+4P2O12(OH)4] · 12H2O Iso. 4 3m : I4 3m
8.DM.25YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
8.DM.30UdumineliteCa3Al8(PO4)2O12 · 2H2O
8.DM.35DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed · Amor.
8.DM.40Santafeite(Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2OMon.
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.5MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.7ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2OMon.
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.9Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
22.5.10Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
22.5.13OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Fluorescence of MelkoviteHide

Other InformationHide

Notes:
Slowly soluble in concentrated HCl
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 MelkoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Egorov, B.L., Dara, A.D., Senderova, V.M. (1969) Melkovite, a new phosphate-molybdate from the zone of oxidation. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 98(2): 207-212.
Fleischer, M. (1970) New mineral names. American Mineralogist: 55: 317-323.
Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76: 1175-1207.

Internet Links for MelkoviteHide

Localities for MelkoviteHide

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.
Australia
 
  • Western Australia
    • Ravensthorpe Shire
W.D. Birch, A. Pring & K. Wallwork (2002) Mendozavilite from the Fitzgerald River District, Western Australia, Australian Journal of Mineralogy, 8, 11-15.; Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207
Italy
 
  • Sardinia
    • Cagliari metropolitan city (Metropolitan City of Cagliari)
      • Sarroch
Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76, 1175-1207
Kazakhstan (TL)
 
  • Karaganda
    • Shet District
      • Mointy (Moyynty)
        • Mointy Railway Station
          • Shunak Mts
Egorov, B. L., Dara, A. D., Senderova, V. M. (1969) Melkovite, a new phosphate-molybdate from the zone of oxidation. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 98 (2): 207-212.; Kampf, A.R., Mills, S.J., Rumsey, M.S., Dini, M., Birch, W.D., Spratt, J., Pluth, J.J., Steele, I.M., Jenkins, R.A., Pinch, W.W. (2012): The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76: 1175-1207 ; Yegorov, B. L., Dora, A. D., & Senderova, V. M. (1970). Melkovite, a new phosphomolybdate from the oxidized zone. International Geology Review, 12(12), 1411-1415.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 21, 2018 17:41:59 Page generated: September 22, 2018 07:39:06
Go to top of page