Polymignite
A synonym of 'Zirconolite-3O'
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About Polymignite
Formula:
(Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O4
Lustre:
Vitreous, Sub-Metallic
Hardness:
6 - 6½
Specific Gravity:
4.77 - 4.85
Crystal System:
Orthorhombic
Name:
Named by Berzelius (1824) after the greek ρoλυς, much, and μιγνυω, I mix, in allusion to the great number of substances of which it is composed.
Synonym:
A synonym of Zirconolite-3O
Described as a new mineral by Berzelius (1824) from a syenite pegmatite at Fredriksvärn (now: Stavern), Vestfold, Norway. The specimens were collected by Nils Otto Tank (1800-1864) in the beginning of the 1820s, when he was a student of mineralogy. Polymignite at Stavern is metamict. Brögger (1890) described in detail the morphology and the chemical and physical properties. Lima-de-Faria (1958) found that recrystallization at 700℃ of the type material gave a cubic phase (with fluorite structure). Pudovkina et al. (1969) calculated, based on the axial ratios (0.712:1:0.512) given by Brögger (1890) and the cell unit volume, that polymignite is orthorhombic.
Later shown to be identical with zirconolite described in 1956, and subsequently discredited in 1988. In spite of its priority and wide use in the literature, polymignite is now considered a metamict, originally orthorhombic variety of zirconolite.
Later shown to be identical with zirconolite described in 1956, and subsequently discredited in 1988. In spite of its priority and wide use in the literature, polymignite is now considered a metamict, originally orthorhombic variety of zirconolite.
Unique Identifiers
Mindat ID:
3261 (as Polymignite)
6657 (as Zirconolite-3O)
6657 (as Zirconolite-3O)
Long-form identifier:
mindat:1:1:3261:8 (as Polymignite)
mindat:1:1:6657:6 (as Zirconolite-3O)
mindat:1:1:6657:6 (as Zirconolite-3O)
Internet Links for Polymignite
mindat.org URL:
https://www.mindat.org/min-3261.html
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Please feel free to link to this page.
References for Polymignite
Reference List:
Berzelius, J. (1824) Undersökning af några Mineralier. 2. Polymignit. Kungliga Svenska vetenskapsakademiens handlingar, S. 3 Vol. 12. Kungl. Svenska vetenskapsakademien. 338-345
Berzelius, Jöns. J. (1825) Account of two newly discovered Mineral Species. The Edinburgh Journal of Science, S. 1 Vol. 3 (4) 327-332Translated from German version
Klåstad Quarry, Klåstad, Tjølling, Larvik Commune, Vestfold, Norway