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Novákite

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Formula:
Cu20AgAs10
Colour:
Steel-grey; Grey
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
6.7
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Jiří Novák (1902-1971), professor of mineralogy at Charles University, Prague.
This page provides mineralogical data about Novákite.


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Classification of NovákiteHide

Approved
2.AA.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2.4.18.1

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
1.39

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)

Physical Properties of NovákiteHide

Metallic
Colour:
Steel-grey; Grey
Comment:
Steel-grey on fresh surface, but turn iridescent and later black
Streak:
Black
Hardness:
3 - 3½ on Mohs scale
Cleavage:
None Observed
Density:
6.7 g/cm3 (Measured)    
Comment:
Value only approximate: intergrown with löllingite and chalcocite

Optical Data of NovákiteHide

Type:
Anisotropic
Anisotropism:
Medium strong: dark blue-gray and light brown ocher color effects in marginal positions
Pleochroism:
Non-pleochroic
Comments:
None observed.

Chemical Properties of NovákiteHide

Formula:
Cu20AgAs10
IMA Formula:
(Cu,Ag)21As10

Crystallography of NovákiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 16.29 Å, b = 11.71 Å, c = 10 Å
β = 112.7°
Ratio:
a:b:c = 1.391 : 1 : 0.854
Unit Cell V:
1,759.80 ų (Calculated from Unit Cell)
Morphology:
Granular aggregates

Type Occurrence of NovákiteHide

General Appearance of Type Material:
Forms steel-gray granular aggregates.
Geological Setting of Type Material:
Carbonate veins at Černý Důl, Czech Republic
Associated Minerals at Type Locality:

Synonyms of NovákiteHide

Other Language Names for NovákiteHide

German:Novakit
Simplified Chinese:砷铜银矿
Spanish:Novakita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz5 photos of Novákite associated with Quartz on mindat.org.
Calcite1 photo of Novákite associated with Calcite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.AA.Domeykite-βCu3-xAs
2.AA.10aAlgodonite(Cu1-xAsx)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.AA.10bDomeykiteCu3AsIso. 4 3m : I4 3d
2.AA.10dKoutekiteCu5As2Hex.
2.AA.20CuprostibiteCu2(Sb,Tl)Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
2.AA.25KutinaiteAg6Cu14As7 Iso.
2.AA.30Allargentum(Ag1-xSbx)Hex.
2.AA.35DyscrasiteAg3SbOrth. mm2 : Pmm2
2.AA.40MaldoniteAu2BiIso. m3m (4/m 3 2/m) : Fd3m
2.AA.45StistaiteSnSbTrig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

1.1CopperCuIso. m3m (4/m 3 2/m) : Fm3m
1.2SilverAgIso. m3m (4/m 3 2/m) : Fm3m
1.5GoldAuIso. m3m (4/m 3 2/m) : Fm3m
1.6AuricuprideCu3AuOrth.
1.7Tetra-auricuprideAuCuTet.
1.8ZincZnHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.9CadmiumCdHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.10DanbaiteCuZn2Iso.
1.11ZhanghengiteCuZnIso.
1.12MercuryHgTrig. 3m (3 2/m) : R3m
1.13KolymiteCu7Hg6Iso.
1.14MoschellandsbergiteAg2Hg3Iso. m3m (4/m 3 2/m)
1.15EugeniteAg11Hg2Iso.
1.16SchachneriteAg1.1Hg0.9Hex.
1.17ParaschachneriteAg3Hg2Orth.
1.18LuanheiteAg3HgHex.
1.19Weishanite(Au,Ag)3Hg2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.20IndiumInTet.
1.21AluminiumAlIso. m3m (4/m 3 2/m) : Fm3m
1.22Khatyrkite(Cu,Zn)Al2Tet.
1.23Cupalite(Cu,Zn)AlOrth.
1.24DiamondCIso. m3m (4/m 3 2/m) : Fd3m
1.25GraphiteCHex. 6mm : P63mc
1.26ChaoiteCHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
1.27LonsdaleiteCHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.28SiliconSi
1.29TinSnTet. 4/mmm (4/m 2/m 2/m) : I41/amd
1.30LeadPbIso. m3m (4/m 3 2/m) : Fm3m
1.31AnyuiiteAuPb2Tet. 4/mmm (4/m 2/m 2/m) : I4/mcm
1.31NovodnepriteAuPb3Tet. 4 2m : I4 2m
1.32LeadamalgamPb0.7Hg0.3Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
1.33ArsenicAsTrig. 3m (3 2/m) : R3m
1.34ArsenolampriteAsOrth. mmm (2/m 2/m 2/m)
1.35PaxiteCuAs2Mon.
1.36KoutekiteCu5As2Hex.
1.37DomeykiteCu3AsIso. 4 3m : I4 3d
1.38Algodonite(Cu1-xAsx)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.40KutinaiteAg6Cu14As7 Iso.
1.41AntimonySbTrig. 3m (3 2/m) : R3m
1.42StibarsenAsSbTrig. 3m (3 2/m) : R3m
1.43ParadocrasiteSb3AsMon. 2 : B2
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
1.46Allargentum(Ag1-xSbx)Hex.
1.47AurostibiteAuSb2Iso. m3 (2/m 3) : Pa3
1.48DyscrasiteAg3SbOrth. mm2 : Pmm2
1.49BismuthBiTrig. 3m (3 2/m) : R3m
1.50MaldoniteAu2BiIso. m3m (4/m 3 2/m) : Fd3m
1.51SulphurS8Orth. mmm (2/m 2/m 2/m) : Fddd
1.52RosickýiteSMon. 2/m : P2/b
1.53SeleniumSeTrig. 3 2 : P31 2 1
1.54TelluriumTeHex.
1.55ChromiumCrIso. m3m (4/m 3 2/m) : Im3m
1.56RheniumReHex.
1.57IronFeIso. m3m (4/m 3 2/m) : Im3m
1.58ChromferideFe3Cr1-x (x=0.6)Iso. m3m (4/m 3 2/m) : Pm3m
1.59FerchromideCr3Fe1-xIso. m3m (4/m 3 2/m) : Pm3m
1.60WairauiteCoFe
1.61NickelNiIso. m3m (4/m 3 2/m) : Fm3m
1.62Kamacite(Fe,Ni)Iso.
1.63Taenite(Fe,Ni)Iso. m3m (4/m 3 2/m) : Fm3m
1.64TetrataeniteFeNiTet.
1.65AwaruiteNi3FeIso. m3m (4/m 3 2/m) : Fm3m
1.66Palladium(Pd,Pt)
1.67PotaritePdHgTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
1.68PaolovitePd2SnOrth.
1.69Stannopalladinite(Pd,Cu)3Sn2Hex.
1.70CabriitePd2CuSnOrth. mmm (2/m 2/m 2/m) : Pmmm
1.71Taimyrite(Pd,Cu,Pt)3SnOrth.
1.72Atokite(Pd,Pt)3SnIso. m3m (4/m 3 2/m) : Fm3m
1.73Rustenburgite(Pt,Pd)3Sn
1.74ZvyagintsevitePd3PbIso.
1.75PlumbopalladinitePd3Pb2Hex.
1.76Osmium(Os,Ir,Ru)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.77Iridium(Ir,Os,Ru)Iso.
1.82PlatinumPtIso. m3m (4/m 3 2/m) : Fm3m
1.83HongshiitePtCuTrig.
1.84NiggliitePtSnHex.
1.85IsoferroplatinumPt3FeIso.
1.86TetraferroplatinumPtFeTet.
1.87TulameenitePt2CuFeTet.
1.88FerronickelplatinumPt2FeNiTet.
1.89Rhodium(Rh,Pt)Iso.

Other InformationHide

Notes:
Diagnostic etching: HNO3 1:1 positive; NCl I :1 positive; FeCl3 20 % positive; HgCl 5 % negative(film); KOH 40%negative; KCN 20% negative.
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 NovákiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johan, Z. & Hak, J. (1961): Novákite, (Cu,Ag)4As3, a new mineral. American Mineralogist. 46: 885-891.
Johan, Z. (1985): The Černý Důl deposit (Czechoslovakia): an example of Ni-, Fe-, Ag-, and Cu-arsenide mineralization with extremely high activity of arsenic; new data on paxite, novakite and kutinaite. Tschermaks Mineralogische und Petrographische Mitteilungen 34, 167-182.

Internet Links for NovákiteHide

Localities for NovákiteHide

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.
Czech Republic (TL)
 
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Krkonoše Mtn (Riesengebirge)
Chemie der Erde (1959) 20, p. 49; Johan, Z. & Hak, J. (1961): Novákite, (Cu,Ag)4As3, a new mineral. American Mineralogist. 46: 885-891; Johan, Z. (1985): The Černý Důl deposit (Czechoslovakia): an example of Ni-, Fe-, Ag-, and Cu-arsenide mineralization with extremely high activity of arsenic; new data on paxite, novakite and kutinaite. Tschermaks Mineralogische und Petrographische Mitteilungen 34, 167-182.
      • Náchod (Nachod)
Černý, P., Doubek, Z., Veselovský, F.: Nerosty z Bělovsi u Náchoda – Jiráskova lomu. Minerál, roč. 11, č. 6, s. 406-418.
USA
 
  • Colorado
    • Montrose Co.
      • La Sal District (Paradox Valley District)
Minerals of Colorado (1997) Eckels, E. B.
Mineral and/or Locality  
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