UM2000-63-SiO:BaHKNaNbSrTi
As tabular crystals.
The empirical formula differs from the above structural one: (Na3.1K0.9Ca0.1Sr0.4Ba0.3Fe0.05)Σ4.85(H3O)2.5(Ti4.1Nb3.9)Σ8(Si4O12)4[O4(OH)4]·15H2O
Unique Identifiers
IMA Classification of UM2000-63-SiO:BaHKNaNbSrTi
Physical Properties of UM2000-63-SiO:BaHKNaNbSrTi
Chemistry of UM2000-63-SiO:BaHKNaNbSrTi
may possibly be simplified as (H3O)3-4(Na,K)4-3(Ti,Nb)8(Si4O12)4(OH,O)8.nH2O (?)
Crystallography of UM2000-63-SiO:BaHKNaNbSrTi
β = 17.40(3)°
Relationship of UM2000-63-SiO:BaHKNaNbSrTi to other Species
| Korobitsynite | (Na,◻)4Ti2(Si4O12)(O,OH)2 · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbam |
| Nenadkevichite | (Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O | Orth. mmm (2/m 2/m 2/m) : Pbam |
| 'Unnamed (Ca-Na-ordered analogue of Korobitsynite)' | (Ca,Na)2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O | Orth. 2 2 2 : P21 21 2 |
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) | 1.7628% | 546 | 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 UM2000-63-SiO:BaHKNaNbSrTi
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References for UM2000-63-SiO:BaHKNaNbSrTi
Localities for UM2000-63-SiO:BaHKNaNbSrTi
Showing 1 localities.
- 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.
Russia | |
| Rastsvetaeva et al. (2000) +1 other reference |
