Radium-bearing Barite
A variety of Baryte
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About Radium-bearing Barite
Formula:
(Ba,Ra)SO4
Colour:
White
Lustre:
Vitreous
Hardness:
3 - 3½
Crystal System:
Orthorhombic
Name:
From radium replacing barium and from the Greek, baryos, "heavy."
A "variety" of baryte containing trace amounts of radium.
The activity of 226Ra in the material from Ohře Rift area, Czech Republic, may reach 8 Bq/g. Scaly precipitates on oil industry equipment may show a radioactivity as high as 103 Bq/g (Ulrych et al., 2007).
See also under Hokutolite.
The activity of 226Ra in the material from Ohře Rift area, Czech Republic, may reach 8 Bq/g. Scaly precipitates on oil industry equipment may show a radioactivity as high as 103 Bq/g (Ulrych et al., 2007).
See also under Hokutolite.
Unique Identifiers
Mindat ID:
7267 (as Radium-bearing Barite)
549 (as Baryte)
549 (as Baryte)
Long-form identifier:
mindat:1:1:7267:6 (as Radium-bearing Barite)
mindat:1:1:549:0 (as Baryte)
mindat:1:1:549:0 (as Baryte)
Physical Properties of Radium-bearing Barite
Optical Data of Radium-bearing Barite
Type:
Biaxial (+)
RI values:
nα = 1.634 - 1.637 nβ = 1.6355 - 1.638 nγ = 1.646 - 1.648
2V:
Measured: 36° to 40°, Calculated: 36° to 42°
Max. Birefringence:
δ = 0.011 - 0.012
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
weak
Chemistry of Radium-bearing Barite
Mindat Formula:
(Ba,Ra)SO4
Element Weights:
Elements listed:
Crystallography of Radium-bearing Barite
Crystal System:
Orthorhombic
Synonyms of Radium-bearing Barite
Other Language Names for Radium-bearing Barite
German:Radiobarit
Radiobaryt
Radiobaryt
Spanish:Radiobarita
Common Associates
Other Information
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 Radium-bearing Barite
mindat.org URL:
https://www.mindat.org/min-7267.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
Mineral Dealers:
References for Radium-bearing Barite
Reference List:
Localities for Radium-bearing Barite
Showing 1 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.
Czech Republic | |
| Matýsek et al. (2026) |
Lahošť quarry, Jeníkov, Jenikov u Duchkova, Teplice District, Ústí nad Labem Region, Czech Republic