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Waimirite-(Y)

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Formula:
YF3
Colour:
Pale pink
Specific Gravity:
5.586 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after the Waimiri-Atroari Indian people of Roraima and Amazonas.
Isostructural with:
Known synthetic analogue. The Y analogue of oskarssonite.

Orthorhombic - unlike the related, trigonal REE fluorides fluocerite-(Ce) and fluocerite-(La).


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Classification of Waimirite-(Y)Hide

Approved
Approval Year:
2013

Physical Properties of Waimirite-(Y)Hide

Transparency:
Transparent, Translucent
Comment:
Non-metallic
Colour:
Pale pink
Streak:
White
Density:
5.586 g/cm3 (Calculated)

Optical Data of Waimirite-(Y)Hide

Type:
Biaxial

Chemical Properties of Waimirite-(Y)Hide

Formula:
YF3

Crystallography of Waimirite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 6.386(1) Å, b = 6.877(1) Å, c = 4.401(1) Å
Ratio:
a:b:c = 0.929 : 1 : 0.64
Unit Cell V:
193.28 ų
Z:
4
Morphology:
Massive aggregates of platy crystals up to ~1 μm in size. Forms are not determined on natural specimens, but synthetic YF3 displays pinacoids, prisms and bipyramids.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.707(26)
3.623(78)
3.438(99)
3.205(100)
2.894(59)
1.937(33)
1.916(24)
1.862(27)
Comments:
From Type Description.

Type Occurrence of Waimirite-(Y)Hide

Place of Conservation of Type Material:
Type material is deposited in the collections of the Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil, specimen number DR919, and the Museu de Mineralogia Luiz Englert, Departamento de Mineralogia e PetrologiaIn
Geological Setting of Type Material:
In hydrothermal veins (up to 30 mm thick) cross-cutting the albite-enriched facies of the ~1820 Ma A-type Madeira granite, Brazil
Associated Minerals at Type Locality:

Synonyms of Waimirite-(Y)Hide

Relationship of Waimirite-(Y) to other SpeciesHide

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 Waimirite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Minuzzii, O.R.R., Ferroni, J.M.T.M., Bastos Netoi, A.C. & Pereira, V. P. (2003) : Primeira Notícia da Descoberta de Waimirita e Atroarita, Dois Novos Minerais na Mina de Pitinga, AM, Brasil. Pesquisas em Geociências, 30 (1): 99-101 http://www.ufrgs.br/igeo/pesquisas/3001/07-3001.pdf
Bastos Neto, A.C., Pereira, V.P., Atencio, D., Ferron, J.T.M.M. and Coutinho, J.M.V. (2014) Waimirite-(Y), IMA 2013-108. CNMNC Newsletter No. 19, February 2014, page 167; Mineralogical Magazine, 78, 165-170.
Atencio D, C. Bastos Neto A, P. Pereira V, T.M.M. Ferron J, M.V. Coutinho J, B. Andrade M, Domanik K (2014): Waimirite-(Y), orthorhombic YF3 from Pitinga Mine, Presidente Figueiredo, Amazonas, Brazil. 21st General Meeting of the IMA (IMA2014), Gauteng, South Africa, September 1-5; Abstract Volume, 372.
Atencio, D., Bastos Neto, A.C., Pereira, V.P., Ferron, J.T.M.M., Hoshino, M., Moriyama, T., Watanabe, Y., Miyawaki, R., Coutinho, J.M.V., Andrade, M.B., Domanik, K., Chukanov, N.V., Momma, K., Hirano, H., Tsunematsu, M. (2015): Waimirite-(Y), orthorhombic YF3, a new mineral from the Pitinga mine, Presidente Figueiredo, Amazonas, Brazil and from Jabal Tawlah, Saudi Arabia: description and crystal structure. Mineralogical Magazine, 79, 767-780.

Internet Links for Waimirite-(Y)Hide

Localities for Waimirite-(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.
Brazil (TL)
 
  • Amazonas
    • Presidente Figueiredo
Bastos Neto, A.C., Pereira, V.P., Atencio, D., Ferron, J.T.M.M. and Coutinho, J.M.V. (2014) Waimirite-(Y), IMA 2013-108. CNMNC Newsletter No. 19, February 2014, page 167; Mineralogical Magazine, 78, 165-170.
Saudi Arabia
 
  • Mintaqah Tabuk
    • Midyan
Atencio, D., Bastos Neto, A.C., Pereira, V.P., Ferron, J.T.M.M., Hoshino, M., Moriyama, T., Watanabe, Y., Miyawaki, R., Coutinho, J.M.V., Andrade, M.B., Domanik, K., Chukanov, N.V., Momma, K., Hirano, H., Tsunematsu, M. (2015): Waimirite-(Y), orthorhombic YF3, a new mineral from the Pitinga mine, Presidente Figueiredo, Amazonas, Brazil and from Jabal Tawlah, Saudi Arabia: description and crystal structure. Mineralogical Magazine, 79, 767-780.
Mineral and/or Locality  
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