UM1977-13-SiO:AlBaCaH
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Formula:
(Ca,Ba)Al2Si3O10(OH)2.6
Hardness:
4½ - 5
Said to be a Ca analogue of edingtonite (formula?), but its PXRD pattern is way different. As polygonal grains in aggregates; also euhedral crystals with hexagonal and rhomboid cross section. Occurs in breccia-forming sulfide aqgregates in roof rocks in the Podol'skoye deposit; intergrown with sulfides (pyrite), and with relic albite and quartz. Abundant.
Unique Identifiers
Mindat ID:
47433
Long-form identifier:
mindat:1:1:47433:5
Physical Properties of UM1977-13-SiO:AlBaCaH
Hardness:
4½ - 5 on Mohs scale
Optical Data of UM1977-13-SiO:AlBaCaH
Type:
Biaxial (-)
RI values:
nα = 1.548 nγ = 1.55
Max. Birefringence:
δ = 0.002
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
Colour in reflected light:
gray, dirty yellow, brownish pink, rarely colorless
Comments:
2V=53-55oC; twins seem to be uniaxial
Chemistry of UM1977-13-SiO:AlBaCaH
Mindat Formula:
(Ca,Ba)Al2Si3O10(OH)2.6
Element Weights:
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.38 Å | (100) |
| 1.745 Å | (100) |
| 3.83 Å | (90) |
| 1.414 Å | (80) |
| 1.324 Å | (80) |
| 1.252 Å | (80) |
| 1.033 Å | (70-80) |
Comments:
does not resemble edingtonite at all
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 UM1977-13-SiO:AlBaCaH
mindat.org URL:
https://www.mindat.org/min-47433.html
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References for UM1977-13-SiO:AlBaCaH
Reference List:
Localities for UM1977-13-SiO:AlBaCaH
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.
Russia | |
| Ismagilov (1977) +1 other reference |
