Laitakarite (original) (raw)
Previously given as Bi4Se2S.
Name:
Named in honor of Aarne Vihtori Laitakari (12 December 1890 Helsinki, Finland - 6 February 1975 Helsinki, Finland), geologist, professor and director general of the Geological Survey of Finland.
A continuous solid-solution series with ikunolite, Bi4S3, probably exists (Schramm et al., 2023).
2.DC.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
C : Variable M:S
2.6.2.4
2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
3.7.22
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi
Comment:
With a high metallic lustre.
Comment:
Old surfaces are lead grey.
Density:
7.93 g/cm3 (Measured)
Comment:
Value represent the average of six determinations with a range of ± 0.08
Anisotropism:
Moderate, pale brown to dark gray
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 50.6% | 53.8% |
| 420nm | 50.4% | 54.0% |
| 440nm | 50.2% | 54.2% |
| 460nm | 50.1% | 54.5% |
| 480nm | 49.9% | 54.6% |
| 500nm | 49.8% | 54.6% |
| 520nm | 49.4% | 54.6% |
| 540nm | 49.1% | 54.6% |
| 560nm | 48.8% | 54.6% |
| 580nm | 48.5% | 54.6% |
| 600nm | 48.2% | 54.5% |
| 620nm | 47.9% | 54.4% |
| 640nm | 47.6% | 54.0% |
| 660nm | 47.2% | 53.5% |
| 680nm | 46.5% | 52.9% |
| 700nm | 45.9% | 52.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 54.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Galena-white
Class (H-M):
3_m_ _(_32/m ) - Hexagonal Scalenohedral
Cell Parameters:
a = 4.22 Å, c = 39.93 Å
Unit Cell V:
615.82 ų (Calculated from Unit Cell)
Morphology:
Grains, size: 0.5-2 mm (TL, Orijärvi), may be graphically intergrown with fine-grained chalcopyrite.
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012737 | Laitakarite | Stasova M M (1968) The crystal structure of bismuthum selenide Bi4Se3 Izvestiya Akademii Nauk SSSR 4 28-31 | 1968 | 0 | 293 |
CIF Raw Data - click here to close
General Appearance of Type Material:
As grains in thin < 2mm large ore-bearing veinlets.
Geological Setting of Type Material:
Quartz-anthophyllite-cordierite rock.
Associated Minerals at Type Locality:
Reference:
Vorma, A. (1959) Laitakariitti Uusi Bi-Se-mineraali Orijärveltä. Geologi: 11(2): 11-11.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.