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Novakite Mineral Data
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General Novakite Information
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 Chemical Formula: |
(Cu,Ag)21As10 |
| Composition: |
Molecular Weight = 2,172.33 gm |
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Copper 55.58 % Cu |
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Silver 9.93 % Ag |
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Arsenic 34.49 % As |
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______ |
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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. |
| Name Pronunciation: |
Novakite  |
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Novakite Image |
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Images:
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Novakite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: C 2/m ? |
| X Ray Diffraction: |
By Intensity(I/Io): 1.877(1), 1.959(0.9), 1.998(0.8), |
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Physical Properties of Novakite
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| Cleavage: |
None |
| Color: |
Steel gray, Black. |
| Density: |
6.7 |
| Diaphaneity: |
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 |
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Optical Properties of Novakite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.60 |
49.00 |
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| 420 nm |
45.40 |
50.50 |
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| 440 nm |
47.20 |
52.00 |
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| 460 nm |
48.30 |
53.00 |
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| 480 nm |
49.10 |
53.90 |
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| 500 nm |
49.80 |
54.60 |
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| 520 nm |
50.20 |
55.20 |
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| 540 nm |
50.60 |
55.60 |
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| 560 nm |
50.90 |
56.00 |
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| 580 nm |
51.20 |
56.30 |
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| 600 nm |
51.30 |
56.60 |
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| 620 nm |
51.40 |
56.80 |
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| 640 nm |
51.50 |
56.90 |
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| 660 nm |
51.50 |
57.00 |
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| 680 nm |
51.50 |
57.10 |
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| 700 nm |
51.50 |
57.20 |
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Calculated Relative Intensity Colors of Novakite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Properties of Novakite
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| Electron Density: |
Bulk Density (Electron Density)=7.36 gm/cc
note: Specific Gravity of Novakite =8.20 gm/cc.
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| Fermion Index: |
Fermion Index = 0
Boson Index = 1 |
| Photoelectric: |
PENovakite = 75.98 barns/electron
U=PENovakite x rElectron Density= 559.25 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Novakite is Not Radioactive |
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Novakite Classification
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| Dana Class: |
02.04.18.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.18)Dana Group |
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02.04.18.01 Novakite (Cu,Ag)21As10 C 2/m ? 2/m |
| Strunz Class: |
02.AA.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.A - Simple Sulfides, Selenides, etc |
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02.AA -Alloys of metalloids with Cu, Ag, Sn, Au |
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02.AA.15 Novakite (Cu,Ag)21As10 C 2/m ? 2/m |
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Other Novakite Information
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| 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Novakite Specimen Label here :
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Novakite
(Cu,Ag)21As10
Dana No: 02.04.18.01 Strunz No: 02.AA.15
Locality:
Notes:
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