| |
 |
Rickardite Mineral Data
|
|
|
General Rickardite Information
|
 Chemical Formula: |
Cu7Te5 |
| Composition: |
Molecular Weight = 1,082.82 gm |
| |
Copper 41.08 % Cu |
| |
Tellurium 58.92 % Te |
| |
______ |
| |
100.00 % |
| Empirical Formula: |
Cu7Te5 |
| Environment: |
A late-stage mineral of low-temperature hydrothermal origin. |
| IMA Status: |
Valid Species (Pre-IMA) 1903 |
| Locality: |
Good Hope mine, Vulcan, Gunnison Co., Colorado, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Thomas Arthur Rickard (1864-1953), mining engineer and Editor of the Engineering and Mining Journal, New York and London. |
| Name Pronunciation: |
Rickardite + Pronunciation  |
| Synonym: |
ICSD 24173 |
| |
PDF 26-1117 |
| |
Rickardite Image |
|
Images:
|
|
Cameronite Rickardite Vulcanite
Comments: Gray metallic massive cameronite showing subconchoidal fracture associated with purple rickardite and bronzy plates of vulcanite in a mass of tellurium, co-type specimen.
Location: Good Hope mine, Vulcan District, Gunnison County, Colorado, USA.
Scale: See Image.
© Rruff Database |
|
Rickardite Crystallography
|
| Axial Ratios: |
a:b:c =0.2012:1:0.6142 |
| Cell Dimensions: |
a = 4.0032, b = 19.893, c = 12.22, Z = 4; V = 973.15 Den(Calc)= 7.39 |
| Crystal System: |
Orthorhombic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 2.07(1), 3.36(0.6), 1.988(0.4),2.55(0.4), 1.158(0.3), 1.706(0.2), 2.82(0.2), |
| |
Physical Properties of Rickardite
|
| Cleavage: |
None |
| Color: |
Violet, Purple red. |
| Density: |
7.54 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
3.5 - Copper Penny |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
| Streak: |
black |
| |
Optical Properties of Rickardite
|
| RL Anisotrophism: |
Strong. |
| RL Pleochroism: |
Strong, carmine to violet-gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rickardite in Air
| λ |
R1 |
R2 |
 |
∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
29.40 |
37.40 |
|
|
|
| 420 nm |
26.80 |
34.80 |
|
| 440 nm |
24.20 |
32.20 |
|
| 460 nm |
21.20 |
29.10 |
|
| 480 nm |
17.80 |
25.80 |
|
| 500 nm |
14.90 |
22.80 |
|
| 520 nm |
13.30 |
20.30 |
|
| 540 nm |
13.00 |
18.40 |
|
| 560 nm |
15.60 |
18.00 |
|
| 580 nm |
20.20 |
18.40 |
|
| 600 nm |
26.50 |
19.80 |
|
| 620 nm |
33.20 |
21.30 |
|
| 640 nm |
39.40 |
24.80 |
|
| 660 nm |
45.00 |
28.00 |
|
| 680 nm |
49.40 |
31.80 |
|
| 700 nm |
53.80 |
35.60 |
|
Calculated Relative Intensity Colors of Rickardite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
450% |
480% |
| R1 |
|
|
|
|
|
|
|
|
|
|
|
| R2 |
|
|
|
|
|
|
|
|
|
|
|
|
| |
Calculated Properties of Rickardite
|
| Electron Density: |
Bulk Density (Electron Density)=6.32 gm/cc
note: Specific Gravity of Rickardite =7.39 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PERickardite = 231.48 barns/electron
U=PERickardite x rElectron Density=1,462.90 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rickardite is Not Radioactive |
| |
Rickardite Classification
|
| Dana Class: |
02.16.15.01 (02)Sulfides - Including Selenides and Tellurides |
| |
(02.16)with miscellaneous formulae |
| |
(02.16.15)Dana Group |
| |
02.16.15.01 Rickardite Cu7Te5 Unk Ortho |
| |
02.16.15.02 Oosterboschite (Pd,Cu)7Se3 Unk Ortho |
| Strunz Class: |
02.BA.20a 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.20a Rickardite Cu7Te5 Unk Ortho |
| |
Other Rickardite Information
|
| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Rickardite :
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 Rickardite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Rickardite :
Ask about Rickardite 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 Rickardite Specimen Label here :
|
Rickardite
Cu7Te5
Dana No: 02.16.15.01 Strunz No: 02.BA.20a
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.