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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
Hardness:
5½ - 6
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.

Classification of Písekite-(Y)

Not Approved
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
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http://www.mindat.org/min-29146.html
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Physical Properties of Písekite-(Y)

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

Crystallography of Písekite-(Y)

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

Chemical Properties of Písekite-(Y)

Formula:
(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
Essential elements:
All elements listed in formula:

Relationship of Písekite-(Y) to other Species

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.

References for Písekite-(Y)

Reference List:
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)

Localities for Písekite-(Y)

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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