Geerite Mineral Data + 
|
[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.
- 2.4.7.1 Chalcocite Cu2S P 21/c 2/m
- 2.4.7.2 Djurleite Cu31S16 P 21/n 2/m
- 2.4.7.3 Digenite Cu9S5 R 3m 3 2/m
- 2.4.7.4 Roxbyite Cu1.78S C 2/m 2/m
- 2.4.7.5 Anilite Cu7S4 P nma 2/m 2/m 2/m
- 2.4.7.6 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig
- 2.4.7.7 Spionkopite Cu1.4S P 3m1 ? 3m
- II/B.01-10 Chalcocite Cu2S P 21/c 2/m
- II/B.01-20 Djurleite Cu31S16 P 21/n 2/m
- II/B.01-30 Digenite Cu9S5 R 3m 3 2/m
- II/B.01-40 Roxbyite Cu1.78S C 2/m 2/m
- II/B.01-50 Anilite Cu7S4 P nma 2/m 2/m 2/m
- II/B.01-60 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig
- II/B.01-70 Spionkopite Cu1.4S P 3m1 ? 3m
- II/B.01-80 Yarrowite Cu9S8 P 3m1 ? 3m
General Geerite Information |
|||
 Chemical Formula: |
Cu8S5 | ||
| Composition: |
Molecular Weight = 668.70 gm | ||
| Copper 76.02 % Cu | |||
| Sulfur 23.98 % S | |||
| ______ | |||
| 100.00 % | |||
| Empirical Formula: |
Cu8S5 | ||
| Environment: |
Replacing sphalerite along cleavage traces. | ||
| IMA Status: |
Approved IMA 1980 | ||
| Locality: |
In DeKalb Township, St. Lawrence Co., New York, and from Cuchillo, Winston district, Sierra Co., New Mexico, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
To honor the original collector, Adam Geer, of Utica, New York, USA. | ||
Search for Geerite Images | |||
|
Images:
|
|
||
Geerite Crystallography |
|||
| Axial Ratios: |
a:c = 1:12.22976 | ||
| Cell Dimensions: |
a = 3.83, c = 46.84, Z = 3; V = 595.04 Den(Calc)= 5.60 | ||
| Crystal System: |
TrigonalSpace Group: R 3m, R 3m, or R 32 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.128(1), 1.918(0.5), 1.637(0.3), | ||
Physical Properties of Geerite |
|||
| Color: |
White, Blue gray. | ||
| Diaphaniety: |
Opaque | ||
| Habit: |
Platy - Sheet forms (e.g. micas). | ||
| Hardness: |
3.5-4 - Copper Penny-Fluorite | ||
| Luster: |
Metallic | ||
Optical Properties of Geerite |
|||
| RL Anisotrophism: |
Moderate, in yellow. | ||
| RL Color: |
Bluish white. | ||
| RL Pleochroism: |
Weak. | ||
Calculated Properties of Geerite |
|||
| Electron Density: |
relectron=5.23 gm/cc |
||
| Fermion Index |
Fermion Index = 0.00179 Boson Index = 0.99821 |
||
| Photoelectric: |
PEGeerite = 35.58 barns/electron |
||
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Geerite is Not Radioactive |
||
Geerite Classification |
|||
| Dana Class: |
2.4.7.6 (2)Sulfides - Including Selenides and Tellurides | ||
| (2.4)where Am Bn Xp, with (m+n):p=2:1 | |||
| (2.4.7)Chalcocite Group ([Cu]2-x S] formulae) | |||
| Strunz Class: |
II/B.01-60 II - Sulfides and sulphosalts | ||
| II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Coppersulfides Chalcocite group | |||
| II/B.01 - Chalcocite - Yarrowite series | |||
Other Geerite Information |
|||
| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1) | ||
| See Also: |
Links to other databases for Geerite : 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 Search for Geerite using: Visit our Advertisers for Geerite : Translate Geerite Mineral Data : Ask about Geerite here : Print or Cut-and-Paste your Geerite Specimen Label here :
|
||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |