Oellacherite
About Oellacherite
Unique Identifiers
2815 (as Muscovite)
mindat:1:1:2815:4 (as Muscovite)
Similar Names
| Oellacherit | A synonym of 'Barium-bearing Muscovite' |
Physical Properties of Oellacherite
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Chemistry of Oellacherite
Geological Environment
Common Associates
| 4 photos of Oellacherite associated with Pyrite | FeS2 |
| 3 photos of Oellacherite associated with Dolomite | CaMg(CO3)2 |
| 2 photos of Oellacherite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 2 photos of Oellacherite associated with Sphalerite | ZnS |
| 1 photo of Oellacherite associated with Microcline | K(AlSi3O8) |
| 1 photo of Oellacherite associated with Andradite | Ca3Fe3+2(SiO4)3 |
| 1 photo of Oellacherite associated with Hendricksite | KZn3(Si3Al)O10(OH)2 |
| 1 photo of Oellacherite associated with Galena | PbS |
| 1 photo of Oellacherite associated with Realgar | As4S4 |
| 1 photo of Oellacherite associated with Wallisite | (Cu,Ag)TlPbAs2S5 |
Radioactivity
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 0.0000% | 0 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 9.8161% | 3,043 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Other Information
Internet Links for Oellacherite
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References for Oellacherite
Localities for Oellacherite
Showing 20 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Mason (1987) |
Austria | |
| Strasser (1989) |
Brazil | |
| OLIVEIRA et al. (2000) |
China | |
| Jiang et al. (1996) |
| Jiang et al. (1996) | |
DR Congo | |
| Kampunzu et al. (2009) |
Iraq | |
| Mohammad et al. (2007) |
Italy | |
| Exel (1993) |
New Zealand | |
| Cooper (1996) |
Russia | |
| Rusinov et al. (2008) |
| Kovalev et al. (2023) |
South Korea | |
| Gi Young Jeong (2006) |
| Gi Young Jeong (2006) |
Spain | |
| Kilias et al. (2006) |
Switzerland | |
| Graeser et al. (2003) +1 other reference |
| Graeser et al. (1987) +3 other references |
| 50. (in German) +1 other reference | |
| Stalder et al. (1998) |
UK | |
| Coats (1980) +1 other reference |
USA | |
| Bauer et al. (1933) |
Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland