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Oxy-petscheckite

A variety of Petscheckite
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Formula:
UFe3+2/3◻1/3(Nb,Ta)2O8
Colour:
Black
Lustre:
Metallic
Hardness:
5
Crystal System:
Hexagonal
Metamict.
Occurs as an oxidation phase and intimately intergrown with hydroxy-petscheckite on metamict petscheckite from Antsakoa I pegmatite, Madagascar.



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Unique IdentifiersHide

Mindat ID:
3051 (as Oxy-petscheckite)
3179 (as Petscheckite)
Long-form identifier:
mindat:1:1:3051:5 (as Oxy-petscheckite)
mindat:1:1:3179:6 (as Petscheckite)

Classification of Oxy-petscheckiteHide

Hey's CIM Ref.:
18.3.7

18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths

Physical Properties of Oxy-petscheckiteHide

Lustre:
Metallic
Colour:
Black
Streak:
Brown-black
Hardness:
5 on Mohs scale

Chemistry of Oxy-petscheckiteHide

Mindat Formula:
UFe3+2/3◻1/3(Nb,Ta)2O8
Element Weights:
Element% weight
U35.873 %
Nb28.004 %
O19.290 %
Fe16.833 %

Calculated from ideal end-member formula.
Elements listed:
Fe, Nb, O, Ta, U - search for minerals with similar chemistry

Crystallography of Oxy-petscheckiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 6.42 Å, c = 4.02 Å
Ratio:
a:c = 1 : 0.626
Unit Cell V:
143.49 ų (Calculated from Unit Cell)
Z:
1
Comment:
metamict

RadioactivityHide

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.

Internet Links for Oxy-petscheckiteHide

References for Oxy-petscheckiteHide

Localities for Oxy-petscheckiteHide

Showing 1 localities.

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.
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Locality ListHide

- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Madagascar
 
  • Betsiboka
    • Tsaratanàna District
      • Bekapaika Commune
Mücke et al. (1978)
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