Novakite Mineral Data

Novakite Mineral Data +

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General Novakite Information

Chemical Formula:

(Cu,Ag)21As10

Composition:

Molecular Weight = 2,172.33 gm

Copper 55.58 % Cu

Silver 9.93 % Ag

Arsenic 34.49 % As

______

100.00 %

Empirical Formula:

Cu₁₉Ag₂As₁₀

Environment:

In hydrothermal carbonate veins cutting diopside hornfels lenses in pyroxene gneiss and mica shist.

IMA Status:

Approved IMA 1961

Locality:

Cerny Dul mine, near Berghaus, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Jiri Novak (1902-1971), Czech mineralogist.

Novakite Image

Images:

Novakite Berzelianite

Comments: Gray metallic dendritic novakite in white calcite with tarnished black berzelianite.
Location: Cerny Dul, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Novakite Crystallography

Axial Ratios:

a:b:c =1.3892:1:0.8544

Cell Dimensions:

a = 16.269, b = 11.711, c = 10.007, Z = 4; beta = 112.7° V = 1,758.91 Den(Calc)= 8.20

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.877(1), 1.959(0.9), 1.998(0.8),

Physical Properties of Novakite

Cleavage:

None

Color:

Steel gray, Black.

Density:

6.7

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Tarnishes - Freshly fractured surfaces form a surface oxidation film

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Novakite

RL Anisotrophism:

Medium, dark blue-gray and light brown-ocher.

RL Color:

White with a light cream tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Novakite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	43.60	49.00
420 nm	45.40	50.50
440 nm	47.20	52.00
460 nm	48.30	53.00
480 nm	49.10	53.90
500 nm	49.80	54.60
520 nm	50.20	55.20
540 nm	50.60	55.60
560 nm	50.90	56.00
580 nm	51.20	56.30
600 nm	51.30	56.60
620 nm	51.40	56.80
640 nm	51.50	56.90
660 nm	51.50	57.00
680 nm	51.50	57.10
700 nm	51.50	57.20

**Calculated Relative Intensity Colors of Novakite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Novakite

Electron Density:

r_electron=7.36 gm/cc
note: r_Novakite=8.20 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Novakite= 75.98 barns/electron
U=PE_Novakite x r_electron= 559.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Novakite is Not Radioactive

Novakite Classification

Dana Class:

2.4.18.1 (2)Sulfides - Including Selenides and Tellurides

(2.4)where Am Bn Xp, with (m+n):p=2:1

(2.4.18)Dana Group

2.4.18.1 Novakite (Cu,Ag)21As10 C 2/m ? 2/m

Strunz Class:

II/A.01-60 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.01 - Algodonite - Cuprostibite series

II/A.01-10 Algodonite Cu6As P 6₃/mmc 6/m 2/m 2/m

II/A.01-20 Domeykite Cu3As I 43d 4 3m

II/A.01-30 Horsfordite Cu5Sb Unk Cubic

II/A.01-40 Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m

II/A.01-50 Koutekite Cu5As2 P 6₃/mmc 6/m 2/m 2/m

II/A.01-60 Novakite (Cu,Ag)21As10 C 2/m ? 2/m

II/A.01-70 Cuprostibite Cu2(Sb,Tl) P 4/nmm 4/m 2/m 2/m

Other Novakite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Novakite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Novakite Specimen Label here :

Novakite

(Cu,Ag)21As10
Dana No: 2.4.18.1 Strunz No: II/A.01-60
Locality:

Notes: