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UM1976-05-BO:HMgNaSU
Invalid as an unnamed mineral
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Formula:
(Na,Mg)2(UO2)2BO3(OH)3-4 · nH2O
the latter report (in Aufschluss) does not include S
Colour:
yellow
Reported as "Uranium mineral B". Possibly a variety or different hydrate counterpart of UM1976-06-BO:HMgNaSU, which has similar habit, color, fluorescence, and qualitative chemistry; also similar to third species, UM1976-07-BO:HMgNaSU.
As incrustations on anhydrite, gypsum, hexahydrite, löweite, and starkeyite, from the vicinity of Admont, Styria, Austria.
As incrustations on anhydrite, gypsum, hexahydrite, löweite, and starkeyite, from the vicinity of Admont, Styria, Austria.
Unique Identifiers
Mindat ID:
39919
Long-form identifier:
mindat:1:1:39919:5
Similar Names
| UM1976-06-BO:HMgNaSU | Invalid as an unnamed mineral | Na, Mg, U, B, S, O, H |
| UM1976-07-BO:HMgNaSU | Invalid as an unnamed mineral | Na, Mg, U, B, S, O, H |
IMA Classification of UM1976-05-BO:HMgNaSU
IMA status notes:
Unnamed (probably invalid)
Approval history:
Unnamed, and probably invalid.
Physical Properties of UM1976-05-BO:HMgNaSU
Colour:
Yellow
Optical Data of UM1976-05-BO:HMgNaSU
Type:
Biaxial (-)
RI values:
nα = 1.476 nγ = 1.496
Max. Birefringence:
δ = 0.020
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:
Moderate (negative)
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.
No measured or calculated 2V is on file for this mineral, so the value used here (89°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (89°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Pleochroism:
Weak
Comments:
colorless (X), yellowish (Z)
Comments:
2V ca. 30o
Chemistry of UM1976-05-BO:HMgNaSU
Mindat Formula:
(Na,Mg)2(UO2)2BO3(OH)3-4 · nH2O
the latter report (in Aufschluss) does not include S
the latter report (in Aufschluss) does not include S
Element Weights:
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.79 Å | (90) |
| 9.80 Å | (100) |
| 8.52 Å | (70) |
| 7.70 Å | (90) |
| 6.42 Å | (60) |
| 5.27 Å | (50) |
| 4.85 Å | (70) |
| 4.29 Å | (60) |
| 3.06 Å | (60) |
| 2.88 Å | (50) |
Comments:
d - diffuse; a bit different from UM1976-05-BO:HMgNaSU and UM1976-07-BO:HMgNaSU
Synonyms of UM1976-05-BO:HMgNaSU
Radioactivity
Fluorescence of UM1976-05-BO:HMgNaSU
bright yellow-green
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 UM1976-05-BO:HMgNaSU
mindat.org URL:
https://www.mindat.org/min-39919.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for UM1976-05-BO:HMgNaSU
Reference List:
Walenta, K. (1976): Uranmineralien aus der Gipslagerstätte Schildmauer bei Admont in der Steiermark. Mitt.-Bl. Abt. Mineral. Landesmuseum Joanneum 44, 35-41 (in German).(in: Fleischer, M., Cabri, L.J., Pabst, A. (1977): New mineral names. American Mineralogist: 62: 1261)
Localities for UM1976-05-BO:HMgNaSU
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.
Austria | |
| Walenta (1976) |
