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Melanarsite

A valid IMA mineral species
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02444300014967978777909.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
09150790014963928422868.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
07690210015379795135213.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
04684480014955987658738.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
09150790014963928422868.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
07127950015361014777041.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
04684480014955987658738.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
09150790014963928422868.jpg
Melanarsite

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
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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.


Unique IdentifiersHide

Mindat ID:
46427
Long-form identifier:
mindat:1:1:46427:7
GUID
(UUID V4):
94e2496f-9fbb-45b6-9b97-bdf7c9a19353

IMA Classification of MelanarsiteHide

Classification of MelanarsiteHide

Strunz-mindat (2024):
8.BH.75

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MeaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MelanarsiteHide

Lustre:
Vitreous
Transparency:
Opaque
Colour:
Black
Streak:
Dark green with an olive hue
Hardness:
4 on Mohs scale
Hardness:
VHN100=203 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.39 g/cm3 (Calculated)

Optical Data of MelanarsiteHide

Type:
Biaxial
RI values:
nα = 1.800(1) nγ = 1.910(1)
Warning: number_format() expects parameter 1 to be float, string given in /home/mindat/www/show_class.php on line 4387
Max Birefringence:
δ = 0.110
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Anisotropism:
Very weak
Bireflectance:
Weak
Reflectivity:
WavelengthR1R2
400nm11.4%10.2%
420nm11.1%9.9%
440nm10.9%9.7%
460nm10.6%9.4%
470nm10.5%9.4%
480nm10.4%9.3%
500nm10.2%9.1%
520nm10.1%9.0%
540nm10.0%8.9%
546nm10.0%8.9%
560nm9.9%8.8%
580nm9.8%8.7%
589nm9.7%8.7%
600nm9.7%8.7%
620nm9.6%8.6%
640nm9.5%8.6%
650nm9.5%8.6%
660nm9.4%8.5%
680nm9.4%8.4%
700nm9.3%8.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 11.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Dark grey
Pleochroism:
Weak
Comments:
Observed in the thinnest particles, is strong with Z (very dark greyish-green) > X (green to pale green).
Comments:
Optical sign, β, and 2V not determined.

Chemistry of MelanarsiteHide

Mindat Formula:
K3Cu7Fe3+O4(AsO4)4
Elements listed:
As, Cu, Fe, K, O - search for minerals with similar chemistry
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 Å(100)
7.59 Å(35)
6.084 Å(17)
4.595 Å(26)
3.124 Å(22)
2.763 Å(20)
2.570 Å(23)
2.473 Å(16)
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
45a : [Sulfates, arsenates, selenates, antimonates]

Type Occurrence of MelanarsiteHide

Type Locality:
ⓘ Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia
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:
TenoriteShchurovskyitePharmazinciteOrthoclaseJohillerite
HematiteHatertiteDmisokoloviteBradaczekiteArsmirandite
Aphthitalite
Reference:
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.
Download:
https://rruff.info/rruff_1.0/uploads/MM80_855.pdf

Synonyms of MelanarsiteHide

Related Minerals - Strunz-mindat GroupingHide

8.BH.CrimsonitePbFe3+2(PO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.ReznitskyiteCaMg(VO4)FMon. 2/m : B2/b
8.BH.CuprozheshengitePb4CuZn2(AsO4)2(PO4)2(OH)2Tric. 1 : P1
8.BH.ZheshengitePb4ZnZn2(AsO4)2(PO4)2(OH)2Tric. 1 : P1
8.BH.PeterchiniteZn3Zn2(OH)6As[O3(OH)3]Mon. 2/m : B2/m
8.BH.05ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2Orth. 2 2 2 : C2 2 21
8.BH.10DurangiteNaAl(AsO4)FMon. 2/m : B2/b
8.BH.10IsokiteCaMg(PO4)FMon. 2/m : B2/b
8.BH.10LacroixiteNaAl(PO4)FMon. 2/m : B2/b
8.BH.10MaxwelliteNaFe3+(AsO4)FMon. 2/m : P2/m
8.BH.10PanasqueiraiteCaMg(PO4)(OH,F)Mon.
8.BH.10KononoviteNaMg(SO4)FMon. 2/m : B2/b
8.BH.10ArsenatrotitaniteNaTi(AsO4)OMon. 2/m : B2/b
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
8.BH.20Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20JohntomaiteBaFe2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20Bjarebyite Group
8.BH.20StrontioperloffiteSrMn2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PlumboperloffitePbMn2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20Nigelcookite PbFe2+2V3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20Plumbojohntomaite PbFe2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.25Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth. mmm (2/m 2/m 2/m)
8.BH.25Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4Orth. mmm (2/m 2/m 2/m)
8.BH.25NatropalermoiteNa2SrAl4(PO4)4(OH)4Orth. mmm (2/m 2/m 2/m)
8.BH.30CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.30SewarditeCaFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.35AdeliteCaMg(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ConichalciteCaCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35DuftitePbCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GabrielsonitePbFe3+(As3+O3)OOrth. mm2 : Pmc21
8.BH.35NickelaustiniteCaNi(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35TangeiteCaCu(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35Duftite-alphaPbCu(AsO4)(OH)
8.BH.35GottlobiteCaMg(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35HermannroseiteCaCu(PO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.40ČechitePbFe2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m)
8.BH.40DescloizitePbZn(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40MottramitePbCu(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40PyrobelonitePbMn2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40Khorixasite(Bi0.67◻0.33)Cu(VO4)(OH)Mon. 2/m : P2/m
8.BH.45BayldonitePbCu3(AsO4)2(OH)2Mon. 2/m : B2/b
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2Mon. 2/m : B2/m
8.BH.50PaganoiteNiBi(AsO4)OTric. 1 : P1
8.BH.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2Trig. 3m (3 2/m) : R3m
8.BH.55JagoweriteBaAl2(PO4)2(OH)2Tric.
8.BH.60AttakoliteCaMn2+Al4(SiO3OH)(PO4)3(OH)4Mon. 2/m : B2/m
8.BH.65LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam
8.BH.70KatiarsiteKTiO(AsO4)Orth. mm2 : Pna21
8.BH.70YurgensoniteK2SnTiO2(AsO4)2Orth. mm2 : Pna21
8.BH.80MoraskoiteNa2Mg(PO4)FOrth. mmm (2/m 2/m 2/m) : Pbcn
8.BH.80EvseeviteNa2Mg(AsO4)FOrth. mmm (2/m 2/m 2/m) : Pbcn
8.BH.85PiccoliiteNaCaMn3+2(AsO4)2O(OH)Orth. mmm (2/m 2/m 2/m) : Pbcm

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.

Internet Links for MelanarsiteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Kamchatka Krai
    • Milkovsky District
      • Tolbachik Volcanic field
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Pekov et al. (2016)
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