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Yellowish brown to black
5½ - 6
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)

'Grandfathered' (first described prior to 1959)

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

Physical Properties of Písekite-(Y)

Vitreous, Resinous
Yellowish brown to black
Hardness (Mohs):
5½ - 6
4.032 g/cm3 (Measured)    

Crystallography of Písekite-(Y)

Crystals elongated [010] and flattened {100}.

Chemical Properties of Písekite-(Y)

Elements listed in formula:

Relationship of Písekite-(Y) to other Species

4.00.Microlite Group(Ca,Na)2Ta2(O,OH,F)7
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group

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) URL:
Please feel free to link to this page.

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
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