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UM2001-23-SiO:CaHU

Valid as an unnamed mineral
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Formula:
Ca(UO2)2(SiO3OH)2 · 5H2O
Specific Gravity:
3.86 (Calculated)
Crystal System:
Monoclinic
Isostructural with:
Parauranophane, Uranophane
Said to be distinct from the two above polymorphs.


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Unique IdentifiersHide

Mindat ID:
54304
Long-form identifier:
mindat:1:1:54304:2

Similar NamesHide

UM1956-02-SiO:CaHUCaUSiO6 · H2O
UM1960-07-SiO:CaHUCa-U-Si-O-H
UM1977-14-SiO:CaHCa2SiO4 · H2O
UM1981-24-SiO:CaU~(Ca,K,Ba)U8Si2O21
UM1981-25-SiO:CaU~(Ca,Mg,K,Ba)U7Si4O21
UM1981-26-SiO:CaU~(Ca,K,Mg)U3Si11O29 (?)
UM1981-28-SiO:CaU~(Ca,K,Ba)U5Si11O33
UM1997-50-SiO:CaHUValid as an unnamed mineralCa2(UO2)2(Si2O5)3 · 10H2O

IMA Classification of UM2001-23-SiO:CaHUHide

IMA status notes:
Unnamed (probably valid)

Physical Properties of UM2001-23-SiO:CaHUHide

Density:
3.86 g/cm3 (Calculated)

Chemistry of UM2001-23-SiO:CaHUHide

Mindat Formula:
Ca(UO2)2(SiO3OH)2 · 5H2O
Element Weights:
Element% weight
U55.589 %
O31.760 %
Si6.559 %
Ca4.680 %
H1.412 %

Calculated from ideal end-member formula.
Elements listed:
Ca, H, O, Si, U - search for minerals with similar chemistry

Crystallography of UM2001-23-SiO:CaHUHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/b
Cell Parameters:
a = 6.670(4) Å, b = 15.92(2) Å, c = 6.985(3) Å
α = 97.3°
Ratio:
a:b:c = 0.419 : 1 : 0.439
Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
2

RadioactivityHide

Radioactivity:
Element % Content Activity (Bq/kg) Radiation Type
Uranium (U) 55.5888% 13,897,200 α, β, γ
Thorium (Th) 0.0000% 0 α, β, γ
Potassium (K) 0.0000% 0 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.

Interactive Simulator:

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: –

DistanceDose rateRisk
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 InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for UM2001-23-SiO:CaHUHide

References for UM2001-23-SiO:CaHUHide

Localities for UM2001-23-SiO:CaHUHide

Showing 1 localities.

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.
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Locality ListHide

- 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.
Russia
 
  • Zabaykalsky Krai
    • Krasnokamensky District
      • Krasnokamensk
Barinova et al. (2001) +1 other reference
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