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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.


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Physical Properties of UM1977-13-SiO:AlBaCaHHide

Hardness:
4½ - 5 on Mohs scale

Optical Data of UM1977-13-SiO:AlBaCaHHide

Type:
Biaxial (-)
RI values:
nα = 1.548 nγ = 1.550
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Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Colour in reflected light:
gray, dirty yellow, brownish pink, rarely colorless
Comments:
2V=53-55oC; twins seem to be uniaxial

Chemical Properties of UM1977-13-SiO:AlBaCaHHide

Formula:
(Ca,Ba)Al2Si3O10(OH)2.6

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.38 (100)
1.745 (100)
3.83 (90)
1.414 (80)
1.324 (80)
1.252 (80)
1.033 (70-80)
Comments:
does not resemble edingtonite at all

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.

References for UM1977-13-SiO:AlBaCaHHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ismagilov, M.I. (1977): Calcium edingonite from pyrite deposits of the southern Urals. Doklady Earth Sci. Sect.: 234: l70-l72 (English trans. of Doklady Akad. Nauk SSSR: 234: 1445-1447 (1977)); in: Dunn, P.J., Fleischer, M., Langley, R.H., Shigley, J.E., Zilczer, J.A. (1985): New mineral names. American Mineralogist: 70: 878
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se/Valid2009_03.pdf (2016)

Internet Links for UM1977-13-SiO:AlBaCaHHide

Localities for UM1977-13-SiO:AlBaCaHHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Orenburg Oblast
Ismagilov, M.I. (1977): Calcium edingonite from pyrite deposits of the southern Urals. Doklady Earth Sci. Sect.: 234: l70-l72 (English trans. of Doklady Akad. Nauk SSSR: 234: 1445-1447 (1977)); in: Dunn, P.J., Fleischer, M., Langley, R.H., Shigley, J.E., Zilczer, J.A. (1985): New mineral names. American Mineralogist: 70: 878
 
Mineral and/or Locality  
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