| |
 |
Naumannite Mineral Data
|
|
|
General Naumannite Information
|
 Chemical Formula: |
Ag2Se |
| Composition: |
Molecular Weight = 294.70 gm |
| |
Silver 73.21 % Ag |
| |
Selenium 26.79 % Se |
| |
______ |
| |
100.00 % |
| Empirical Formula: |
Ag2Se |
| Environment: |
In hydrothermal veins associated with other selenides, quartz, and carbonates. |
| IMA Status: |
Valid Species (Pre-IMA) 1845 |
| Locality: |
Tilkerode (Abberode) and St. Anreasberg, Harz Mountains, Saxony-Anhalt, Germany Link to MinDat.org Location Data. |
| Name Origin: |
Named for Carl Friedrich Naumann (1797-1873), German mineralogist and crystallographer. |
| Name Pronunciation: |
Naumannite + Pronunciation  |
| Synonym: |
ICSD 15213 |
| |
PDF 24-1041 |
| |
Naumannite Image |
|
Images:
|
|
Naumannite Crystallography
|
| Axial Ratios: |
a:b:c =0.6135:1:1.097 |
| Cell Dimensions: |
a = 4.336, b = 7.067, c = 7.753, Z = 4; V = 237.57 Den(Calc)= 8.24 |
| Crystal System: |
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.56(1), 2.66(1), 2.23(0.6), |
| |
Physical Properties of Naumannite
|
| Cleavage: |
{???} Perfect, {???} Perfect, Perfect |
| Color: |
Grayish black, Iron black. |
| Density: |
6.5 - 8, Average = 7.25 |
| Diaphaneity: |
Opaque |
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
2.5 - Finger Nail |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
| Streak: |
black |
| |
Optical Properties of Naumannite
|
| RL Anisotrophism: |
Distinct but weak, light gray to dark gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Naumannite in Air
| λ |
R1 |
R2 |
 |
∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
36.30 |
40.70 |
|
|
|
| 420 nm |
37.00 |
40.60 |
|
| 440 nm |
37.70 |
40.50 |
|
| 460 nm |
38.00 |
40.20 |
|
| 480 nm |
38.10 |
39.60 |
|
| 500 nm |
37.80 |
38.90 |
|
| 520 nm |
37.00 |
38.10 |
|
| 540 nm |
35.70 |
37.30 |
|
| 560 nm |
34.60 |
36.70 |
|
| 580 nm |
33.80 |
36.20 |
|
| 600 nm |
33.20 |
35.80 |
|
| 620 nm |
32.70 |
35.50 |
|
| 640 nm |
32.20 |
35.00 |
|
| 660 nm |
31.80 |
34.70 |
|
| 680 nm |
31.50 |
34.30 |
|
| 700 nm |
31.20 |
34.80 |
|
Calculated Relative Intensity Colors of Naumannite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
| R1 |
|
|
|
|
|
|
|
|
|
|
|
| R2 |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Calculated Properties of Naumannite
|
| Electron Density: |
Bulk Density (Electron Density)=7.16 gm/cc
note: Specific Gravity of Naumannite =8.24 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PENaumannite = 213.70 barns/electron
U=PENaumannite x rElectron Density=1,529.68 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Naumannite is Not Radioactive |
| |
Naumannite Classification
|
| Dana Class: |
02.04.01.02 (02)Sulfides - Including Selenides and Tellurides |
| |
(02.04)where Am Bn Xp, with (m+n):p=2:1 |
| |
(02.04.01)Acanthite Group |
| |
02.04.01.01 Acanthite Ag2S P 21/n 2/m |
| |
02.04.01.02 Naumannite Ag2Se P 212121 2 2 2 |
| |
02.04.01.03 Aguilarite Ag4SeS P 212121 2 2 2 |
| Strunz Class: |
02.BA.30b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
| |
02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
| |
02.BA -With Cu, Ag, Au |
| |
02.BA.30b Aguilarite Ag4SeS P 212121 2 2 2 |
| |
02.BA.30b Naumannite Ag2Se P 212121 2 2 2 |
| |
Other Naumannite Information
|
| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Naumannite :
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
15 - WWW-MINCRYST
Search for Naumannite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Naumannite :
Ask about Naumannite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Naumannite Specimen Label here :
|
Naumannite
Ag2Se
Dana No: 02.04.01.02 Strunz No: 02.BA.30b
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.
