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

Melanarsite

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

About MelanarsiteHide

Formula:
K3Cu7Fe3+O4(AsO4)4
Colour:
Black
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
4.39 (Calculated)
Crystal System:
Monoclinic
Name:
The name reflects belonging of the mineral to arsenates and its black colour (colour name taken from Greek)
New structure type: heteropolyhedral pseudo-framework comprises distorted Cu(1-3)O6 and (Fe,Cu)O6 octahedra, and As(1-3)O4 tetrahedra. There are tunnels and voids occupied by two independent K atoms ([8]K & [7]K).

Melanarsite is the second K-Cu-Fe-As mineral after obradovicite-KCu.


Classification of MelanarsiteHide

Approved
Approval Year:
2014
First Published:
2016

Physical Properties of MelanarsiteHide

Vitreous
Transparency:
Opaque
Colour:
Black
Hardness:
Hardness:
VHN100=203 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.39 g/cm3 (Calculated)

Optical Data of MelanarsiteHide

Type:
Anisotropic
Anisotropism:
very weak
Reflectivity:
nmR=0.5–9.4 (470%
nmR=0.0–8.9 (546%
nmR=.7–8.7 (589%
nmR=.5–8.6 (650%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 0.5–9.4 (470%.
Colour in reflected light:
dark grey

Chemical Properties of MelanarsiteHide

Formula:
K3Cu7Fe3+O4(AsO4)4
Common Impurities:
Zn

Crystallography of MelanarsiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 11.4763(9) Å, b = 16.620(2) Å, c = 10.1322(8) Å
β = 105.078(9)°
Ratio:
a:b:c = 0.691 : 1 : 0.61
Unit Cell V:
1,866.04 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular to prismatic crystals up to 0.4 mm; clusters; forming crust

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.22(100)
7.59(35)
6.084(17)
4.595(26)
3.124(22)
2.763(20)
2.570(23)
2.473(16)
Comments:
From Type Description.

Type Occurrence of MelanarsiteHide

General Appearance of Type Material:
Tabular to prismatic crystals up to 0.4 mm, separate or combined in clusters up to 1 mm across or in interrupted crusts up to 0.02 x 1 x 1 cm covering basalt scoria.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4550/1
Geological Setting of Type Material:
Fumaroles
Associated Minerals at Type Locality:

Synonyms of MelanarsiteHide

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 MelanarsiteHide

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., Polekhovsky, Y.S., Vigasina, M.F., Belakovskiy, D.I., Britvin, S.N., Sidorov, E.G. and Pushcharovsky, D.Y. (2014) Melanarsite, IMA 2014-048. CNMNC Newsletter No. 22, October 2014, page 1244; Mineralogical Magazine, 78, 1241-1248
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Polekhovsky, Yu.S., Vigasina, M.F., Belakovskiy, D.I., Britvin, S.N., Sidorov, E.G., Pushcharovsky, D.Y. (2016) New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. VI. Melanarsite, K3Cu7Fe^3+O4(AsO4)4. Mineralogical Magazine, 80, 855-867.

Internet Links for MelanarsiteHide

Localities for MelanarsiteHide

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., Polekhovsky, Y.S., Vigasina, M.F., Belakovskiy, D.I., Britvin, S.N., Sidorov, E.G. and Pushcharovsky, D.Y. (2014) Melanarsite, IMA 2014-048. CNMNC Newsletter No. 22, October 2014, page 1244; Mineralogical Magazine, 78, 1241-1248
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 22, 2018 04:36:00 Page generated: September 26, 2018 17:31:55
Go to top of page