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Novákite

A valid IMA mineral species
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About NovákiteHide

09368450017068063722383.jpg
Jiří Novák
Formula:
(Cu,Ag)21As10
Previously given as 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 (23 December 1902, Uherský Brod, Austria-Hungary - 21 May 1971), professor of mineralogy at Charles University, Prague. He later held positions of dean and vice-rector at the university.
This page provides mineralogical data about Novákite.


Unique IdentifiersHide

Mindat ID:
2938
Long-form identifier:
mindat:1:1:2938:0
GUID
(UUID V4):
14822d7f-a81c-40cf-adf3-bb1cc7b39677

IMA Classification of NovákiteHide

Approved
Approval year:
1960
First published:
1959

Classification of NovákiteHide

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)

Mineral SymbolsHide

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

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

Physical Properties of NovákiteHide

Metallic
Transparency:
Opaque
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)    8.01 g/cm3 (Calculated)
Comment:
Value only approximate: intergrown with löllingite and chalcocite

Optical Data of NovákiteHide

Anisotropism:
Medium strong: dark blue-gray and light brown ocher color effects in marginal positions
Reflectivity:
WavelengthR1R2
400nm43.6%49.0%
420nm45.4%50.5%
440nm47.2%52.0%
460nm48.3%53.0%
480nm49.1%53.9%
500nm49.8%54.6%
520nm50.2%55.2%
540nm50.6%55.6%
560nm50.9%56.0%
580nm51.2%56.3%
600nm51.3%56.6%
620nm51.4%56.8%
640nm51.5%56.9%
660nm51.5%57.0%
680nm51.5%57.1%
700nm51.5%57.2%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 57.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White with pale cream tint
Pleochroism:
Non-pleochroic
Comments:
None observed.

Chemistry of NovákiteHide

Mindat Formula:
(Cu,Ag)21As10

Previously given as Cu20AgAs10.

Crystallography of NovákiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 16.269(3) Å, b = 11.711(2) Å, c = 10.007(2) Å
β = 112.74°
Ratio:
a:b:c = 1.389 : 1 : 0.854
Unit Cell V:
1,758.39 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Granular aggregates
Comment:
Point Group: 2, m, or 2/m; Space Group: C2, Cm, or C2/m.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
1.877 Å(10)
1.959 Å(9)
1.180 Å(9)
1.998 Å(8)
1.351 Å(6)
1.225 Å(6)
6.41 Å(5)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of NovákiteHide

General Appearance of Type Material:
Forms steel-gray granular aggregates.
Place of Conservation of Type Material:
National School of Mines, Paris, France; National Museum of Natural History, Washington, D.C., USA, 116992.
Geological Setting of Type Material:
Carbonate veins at Černý Důl, Czech Republic
Associated Minerals at Type Locality:
Reference:
Johan, Z., Hak, J. (1959) Novákit - (Cu,Ag)4As3, ein neues Mineral. Chemie der Erde: 20: 49-50.

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:
5 photos of Novákite associated with QuartzSiO2
1 photo of Novákite associated with CalciteCaCO3

Related Minerals - Strunz-mindat GroupingHide

2.AA.TrigodomeykiteCu3-xAsTrig. 3 : P3
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. m3m (4/m 3 2/m)
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
2.AA.50ZaccariniiteRhNiAs Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
2.AA.55DieneriteNi3AsIso. 4 3m : I4 3d

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.

Internet Links for NovákiteHide

References 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 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.
Czech Republic
 
  • Hradec Králové Region
    • Náchod District
      • Náchod
Černý
    • Trutnov District
Chemie der Erde (1959) +3 other references
Poland
 
  • Lower Silesian Voivodeship
    • Karkonosze County
      • Szklarska Poręba
Kozłowski et al. (2022)
USA
 
  • Colorado
    • Montrose County
      • La Sal Mining District (Paradox Valley Mining District)
Eckel et al. (1997)
 
矿物 and/or 产地  
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