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Písekite-(Y)

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Formula:
(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
Colour:
Yellowish brown to black
Lustre:
Vitreous, Resinous
Hardness:
5½ - 6
Specific Gravity:
4.032
Name:
After the locality of Pisek, Bohemia, Czech Republic.
A synonym for "Monazite-(Y)" (not a valid species) from Písek, Czech Republic. Possibly considered a valid species by some with formula (Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4.


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Classification of Písekite-(Y)Hide

'Grandfathered' (first described prior to 1959)
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :

Physical Properties of Písekite-(Y)Hide

Vitreous, Resinous
Colour:
Yellowish brown to black
Streak:
Gray
Hardness:
5½ - 6 on Mohs scale
Fracture:
Conchoidal
Density:
4.032 g/cm3 (Measured)    

Chemical Properties of Písekite-(Y)Hide

Formula:
(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4

Crystallography of Písekite-(Y)Hide

Morphology:
Crystals elongated [010] and flattened {100}.

Related Minerals - Nickel-Strunz GroupingHide

4.00.Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
4.00.Microlite GroupIso. m3m (4/m 3 2/m) : Fd3m
4.00.Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group
4.00.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.00.UM2004-19-O:AlCeGdZr(Gd,Ce)4Al2Zr4O17
4.00.UM2004-21-O:CaFeGdZrCa2Gd4Fe5ZrO15
4.00.UM2004-27-O:GdTiGd2Ti4O11
4.00.Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
4.00.AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
4.00.VapnikiteCa2CaUO6Mon. 2/m

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 Písekite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Krejči (1923), Časopis Min. Geol. Prague: 1: 2.
Nováček (1936), Vĕda Příodin Jahrg.: 17: 1. - Min. Abs. (1937): 6: 507.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 807.
Lithos (1972): 5: 93-103.
Strunz-Nickel (2001): 209.

Internet Links for Písekite-(Y)Hide

Localities for Písekite-(Y)Hide

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.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • South Bohemia Region
      • Písek
Petr Černý, Milan Novák, Ron Chapman, Karen J. Ferreira (2007) Subsolidus behavior of niobian rutile from the Písek region, Czech Republic: a model for exsolution in W- and Fe2+>>Fe3+-rich phases. Journal of Geosciences, 52:143–159
Historic mineral collection National museum of Czech Republic
Mineral and/or Locality  
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