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Písekite-(Y)

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U obrázku quarry, Písek, South Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic




Formula:
(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O
 
4
Colour:Yellowish brown to blackHardness: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)

IMA status:Not Approved
Nickel-Strunz 10th (pending) edition ID:4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
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Physical Properties of Písekite-(Y)

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

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)O
 
4
Essential elements:Nb, O, Y
All elements listed in formula:As, Ca, Fe, Nb, O, Ta, Ti, U, Y

Relationship of Písekite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.00.Microlite Group
4.00.Pyrochlore Group
A
 
2
Nb
 
2
(O,OH)
 
6
Z
4.00.Roméite Group
4.00.UM2004-19-O:AlCeGdZr
(Gd,Ce)
 
4
Al
 
2
Zr
 
4
O
 
17
4.00.UM2004-21-O:CaFeGdZr
Ca
 
2
Gd
 
4
Fe
 
5
ZrO
 
15
4.00.UM2004-27-O:GdTi
Gd
 
2
Ti
 
4
O
 
11

Other Information

Health Warning: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)

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    • Localities for Písekite-(Y)

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    (TL) indicates type locality. ? 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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