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Novákite

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


Classification of Novákite

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 Novákite

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

Optical Data of Novákite

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 Novákite

Formula:
Cu20AgAs10
IMA Formula:
(Cu,Ag)21As10
Elements listed in formula:

Crystallography of Novákite

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 Volume:
V 1,759.80 ų (Calculated from Unit Cell)
Morphology:
Granular aggregates

Type Occurrence of Novákite

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

Relationship of Novákite to other Species

2.AA.Domeykite-βCu3-xAs
2.AA.10aAlgodonite(Cu1-xAsx)
2.AA.10bDomeykiteCu3As
2.AA.10dKoutekiteCu5As2
2.AA.20CuprostibiteCu2(Sb,Tl)
2.AA.25KutinaiteAg6Cu14As7
2.AA.30Allargentum(Ag1-xSbx)
2.AA.35DyscrasiteAg3Sb
2.AA.40MaldoniteAu2Bi
2.AA.45StistaiteSnSb
1.1CopperCu
1.2SilverAg
1.5GoldAu
1.6AuricuprideCu3Au
1.7Tetra-auricuprideAuCu
1.8ZincZn
1.9CadmiumCd
1.10DanbaiteCuZn2
1.11ZhanghengiteCuZn
1.12MercuryHg
1.13KolymiteCu7Hg6
1.14MoschellandsbergiteAg2Hg3
1.15EugeniteAg11Hg2
1.16SchachneriteAg1.1Hg0.9
1.17ParaschachneriteAg3Hg2
1.18LuanheiteAg3Hg
1.19Weishanite(Au,Ag)3Hg2
1.20IndiumIn
1.21AluminiumAl
1.22Khatyrkite(Cu,Zn)Al2
1.23Cupalite(Cu,Zn)Al
1.24DiamondC
1.25GraphiteC
1.26ChaoiteC
1.27LonsdaleiteC
1.28SiliconSi
1.29TinSn
1.30LeadPb
1.31AnyuiiteAuPb2
1.31NovodnepriteAuPb3
1.32LeadamalgamPb0.7Hg0.3
1.33ArsenicAs
1.34ArsenolampriteAs
1.35PaxiteCuAs2
1.36KoutekiteCu5As2
1.37DomeykiteCu3As
1.38Algodonite(Cu1-xAsx)
1.40KutinaiteAg6Cu14As7
1.41AntimonySb
1.42StibarsenAsSb
1.43ParadocrasiteSb3As
1.44HorsforditeCu, Sb
1.45CuprostibiteCu2(Sb,Tl)
1.46Allargentum(Ag1-xSbx)
1.47AurostibiteAuSb2
1.48DyscrasiteAg3Sb
1.49BismuthBi
1.50MaldoniteAu2Bi
1.51SulphurS8
1.52RosickýiteS
1.53SeleniumSe
1.54TelluriumTe
1.55ChromiumCr
1.56RheniumRe
1.57IronFe
1.58ChromferideFe3Cr1-x (x=0.6)
1.59FerchromideCr3Fe1-x
1.60WairauiteCoFe
1.61NickelNi
1.62Kamacite(Fe,Ni)
1.63Taenite(Fe,Ni)
1.64TetrataeniteFeNi
1.65AwaruiteNi3Fe
1.66Palladium(Pd,Pt)
1.67PotaritePdHg
1.68PaolovitePd2Sn
1.69Stannopalladinite(Pd,Cu)3Sn2
1.70CabriitePd2CuSn
1.71Taimyrite(Pd,Cu,Pt)3Sn
1.72Atokite(Pd,Pt)3Sn
1.73Rustenburgite(Pt,Pd)3Sn
1.74Zvyagintsevite(Pd,Pt,Au)3(Pb,Sn)
1.75PlumbopalladinitePd3Pb2
1.76Osmium(Os,Ir,Ru)
1.77Iridium(Ir,Os,Ru)
1.82PlatinumPt
1.83HongshiitePtCu
1.84NiggliitePtSn
1.85IsoferroplatinumPt3Fe
1.86TetraferroplatinumPtFe
1.87TulameenitePt2CuFe
1.88FerronickelplatinumPt2FeNi
1.89Rhodium(Rh,Pt)

Other Names for Novákite

Name in Other Languages:
German:Novakit
Simplified Chinese:砷铜银矿
Spanish:Novakita

Other Information

Other Information:
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 Novákite

Reference List:
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 Novákite

mindat.org URL:
https://www.mindat.org/min-2938.html
Please feel free to link to this page.

Localities for Novákite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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