UM1983-16-SO:CaHNa
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Formula:
Na2Ca2(SO4)3 · 3H2O
Reported as "Unnamed Na-Ca-Double Sulfate". Found within moist and fragile crusts on rocks (Lake Bonney shore), and in a 2-cm-thick also moist salt-sand soil horizon (Mt. Elektra). Forms felty needle-like crystals, below 100 microns in size.
Supposed to be structurally related to eugsterite and hydroglauberite.
Chemically similar minerals include the above listed and, e.g., omongwaite.
Supposed to be structurally related to eugsterite and hydroglauberite.
Chemically similar minerals include the above listed and, e.g., omongwaite.
Unique Identifiers
Mindat ID:
47737
Long-form identifier:
mindat:1:1:47737:8
Optical Data of UM1983-16-SO:CaHNa
Type:
Biaxial (+)
RI values:
nα = ~1.487(5) nγ = 1.498
Max. Birefringence:
δ = 0.000
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.
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.
Surface Relief:
Moderate
Optical Extinction:
parallel
Comments:
optical sign not sure; nα < nβ << nγ; γ || needle axis
Chemistry of UM1983-16-SO:CaHNa
Mindat Formula:
Na2Ca2(SO4)3 · 3H2O
Element Weights:
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.51 Å | (70) |
| 3.035 Å | (90) |
| 2.925 Å | (90) |
| 2.883 Å | (100) |
| 2.791 Å | (100) |
| 2.753 Å | (100) |
| 2.653 Å | (80) |
Comments:
from powder-Guinier XR analysis
Other Information
Notes:
soluble in water and (some) immersion liquids
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 UM1983-16-SO:CaHNa
mindat.org URL:
https://www.mindat.org/min-47737.html
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Please feel free to link to this page.
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References for UM1983-16-SO:CaHNa
Reference List:
Localities for UM1983-16-SO:CaHNa
Showing 2 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.
Antarctica | |
| Hodenberg et al. (1983) +1 other reference |
| Hodenberg et al. (1983) +1 other reference |
