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About Formanite-(Y)Hide

5½ - 6½
Crystal System:
After Francis Gloster Forman (1904-1980), government geologist (1934-1945) of Western Australia.

Forman was born in Western Australia on 28 December 1904 and educated at the University of Western Australia. He was Government Geologist of Western Australia (1934-45), employed by mining firms (1945-50) and was consulting geologist in private practice (1950-70). He was a member of the Royal Society of Western Australia and its president in 1937. One of his interests is the native flora and he collected for C. F. Gardner, then Government Botanist, whilst he was on geological field trips.

Hall, N. (1978) Botanists of the eucalypts. Commonwealth Scientific and Industrial Research Organisation, Melbourne

See also iwashiroite-(Y) and yttrotantalite-(Y).

According to single-crystal studies of both untreated and heated formanite-(Y) by Shi & Peng (1981), the mineral equals the M' polymorph of synthetic YTaO4 (Wolten, 1967).

Classification of Formanite-(Y)Hide

Approved, 'Grandfathered' (first described prior to 1959)

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
A : Without additional anions or H2O

1 : ABO4

18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U

Physical Properties of Formanite-(Y)Hide

5½ - 6½ on Mohs scale

Chemical Properties of Formanite-(Y)Hide


Crystallography of Formanite-(Y)Hide

Crystal System:
Class (H-M):
4/m - Dipyramidal
Space Group:
Cell Parameters:
a = 7.73 Å, c = 11.49 Å
a:c = 1 : 1.486
Unit Cell V:
686.56 ų (Calculated from Unit Cell)
Grains and massive

Type Occurrence of Formanite-(Y)Hide

Other Language Names for Formanite-(Y)Hide

Simplified Chinese:黄钇钽矿

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tantalaeschynite-(Y)1 photo of Formanite-(Y) associated with Tantalaeschynite-(Y) on
Fergusonite-(Y)1 photo of Formanite-(Y) associated with Fergusonite-(Y) on
Cassiterite1 photo of Formanite-(Y) associated with Cassiterite on

Related Minerals - Nickel-Strunz GroupingHide

7.GA.05Fergusonite-(Y)YNbO4Tet. 4/m : I41/a
7.GA.05PowelliteCa(MoO4)Tet. 4/m : I41/a
7.GA.05ScheeliteCa(WO4)Tet. 4/m : I41/a
7.GA.05StolzitePb(WO4)Tet. 4/m : I41/a
7.GA.05WulfenitePb(MoO4)Tet. 4/m : I41/a
7.GA.10Iwashiroite-(Y)Y(Ta,Nb)O4Mon. 2/m : P2/b
7.GA.15Paraniite-(Y)Ca2Y(AsO4)(WO4)2Tet. 4/m : I41/a

Related Minerals - Dana Grouping (8th Ed.)Hide 4/m : I41/a,La,Nd)NbO4,Ce)(Nb,Ti)O4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.2.1Fergusonite-(Y)YNbO4Tet. 4/m : I41/a
18.2.2Fergusonite-(Y)-βYNbO4Mon. 2/m
18.2.8Pyrochlore GroupA2Nb2(O,OH)6Z
18.2.9Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.10Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.12Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.14Aeschynite-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
18.2.15Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.18Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
18.2.20Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 Iso. m3m (4/m 3 2/m) : Fm3m

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 Formanite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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: 757-762.
American Mineralogist (1944): 29: 456.
Wolten, G.M. (1967): The structure of the M'-phase of YTaO4, a third fergusonite polymorph. Acta Crystallogr., 23, 939-944.
Wolten, G. M. (1968): The structure of the M'-phase of YTaO4, a third fergusonite polymorph - Correction. Acta Cryst. B24, 463.
Shi, N. & Peng, Z. (1981): Mineralogical investigation on formanite. Chinese Science Bulletin (Kexue Tongbao) 26 (6), 548-551 (in English).
Shih, N. & Peng, Z. (1981) Mineralogy of formanite. K’o Hsueh T’ung Pao, 26(10), 616-617 (in Chinese).

Internet Links for Formanite-(Y)Hide

Localities for Formanite-(Y)Hide

ⓘ - 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.
  • Western Australia
    • East Pilbara Shire
Wylie, A.W. (1954) Lanthanon and Scandium distribution in Western Australian Fergusonite, 39:(7&8), 667-669.
      • Shaw River District
Austral.Ass.Adv.Sci.(1909) 12, 310; Dana's System Mineral., 7th ed.(1944), vol.1, p.757-763
Pegmatites of Western Australia; M Jacobson, M Calderwood, B Grguric; Hesperian Press, Perth, 2007.
  • Manitoba
    • Bird River Greenstone Belt
M. Masau, P. Cerny, M.A. Cooper, R. Chapman & J. Grice (2002) Can. Mineral. 40, 1649-1655
  • Jiangxi Province
    • Ganzhou Prefecture
      • Gan Co.
Zhang Peishan, Yang Zhuming, Tao Kejie, and Yang Xueming (1996): "Mineralogy and Geology of Rare Earths in China", Science Press (Beijing), 226 pp.
Zhang Peishan, Yang Zhuming, Tao Kejie, and Yang Xueming (1996): "Mineralogy and Geology of Rare Earths in China", Science Press (Beijing), 226 pp.
  • Southwestern Finland Region
    • Kemiö Island (Kimito Island)
Pavel M. Kartashov analytical data, Jyrki Autio Collection
  • Western and Inner Finland Region
    • Alavus
P. Kartashov analytical data, J. Dyer material
    • Valkeakoski
Pavel M. Kartashov analytical data of 2017, Jyrki Autio materials
  • Shikoku Island
    • Ehime Prefecture
      • Matsuyama City
Minakawa & Nishio (2002) Ganko-Gakkai Kou'en-Youshi, 287.
  • Lower Silesia
    • Jawor District
SZEŁĘG E., CIURLA A., 2004: Preliminary data on Nb-Ta oxides in pegmatites
  • Murmansk Oblast
    • Keivy Mountains
      • Western Keivy Massif
Voloshin A.V., Lyalina L.M., Savchenko Ye.E., Bogdanova A.N. [Волошин А.В., Лялина Л.М., Савченко Е.Э., Богданова А.Н.] (2003): Formanite-(Y) from the amazonite randpegmatites of Western Keivy (Kola Peninsula) [Форманит-(Y) из амазонитовых рандпегматитов Западных Кейв (Кольский полуостров)]. Zap. RMO [Зап. РМО], 132, 1, 82-93 (in Russian).
  • Uppland
    • Vaxholm
      • Resarö
Pavel M. Kartashov data
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