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Parisite-(La)

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About Parisite-(La)Hide

Formula:
CaLa2(CO3)3F2
Colour:
Yellow-green to white
Lustre:
Vitreous, Dull
Hardness:
4 - 5
Specific Gravity:
4.273 (Calculated)
Crystal System:
Monoclinic
Name:
Named for its relationship to parisite-(Ce) and parisite-(Nd), and for the dominant REE being lanthanum. The root name is in honor of J.J. Paris, former manager of the Muzo emerald mine, Muzo, Columbia, and leasee of the mine from 1828-1848.
The La analogue of parisite-(Ce). Chemically similar to 'synchysite-(La)'.




Classification of Parisite-(La)Hide

Approved
Approval Year:
2016
First Published:
2018

Physical Properties of Parisite-(La)Hide

Vitreous, Dull
Transparency:
Transparent
Comment:
A vitreous (when yellow-green) to dull (when white) lustre
Colour:
Yellow-green to white
Streak:
White
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on pseudo-{001}
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.273 g/cm3 (Calculated)

Optical Data of Parisite-(La)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.670() nε = 1.782
Max Birefringence:
δ = 0.112
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Comments:
Described as pseudo-uniaxial (+)

Chemical Properties of Parisite-(La)Hide

Formula:
CaLa2(CO3)3F2

Crystallography of Parisite-(La)Hide

Crystal System:
Monoclinic
Cell Parameters:
a = 12.356(1) Å, b = 7.1368(7) Å, c = 28.299(3) Å
β = 98.342(4)°
Ratio:
a:b:c = 1.731 : 1 : 3.965
Unit Cell V:
2469.1 ų
Z:
12
Comment:
Space group is C2, Cm, or C2/m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.958(27)
4.655(100)
3.552(48)
2.817(26)
2.323(12)
2.051(13)
1.876(8)
1.659(73)

Type Occurrence of Parisite-(La)Hide

General Appearance of Type Material:
As residual nuclei (up to 5 mm) in steep doubly-terminated pseudo-hexagonal pyramidal crystals (up to 8.2 cm).
Place of Conservation of Type Material:
(1) Mineralogical collections of the Museu de Ciência e Técnica, Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil (registration number SAD2016-031),and (2) at the University of Arizona Mine nr R130687
Geological Setting of Type Material:
A hydrothermal vein crosscutting a metarhyolite.
Associated Minerals at Type Locality:
Reference:
Menezes Filho, L.A.D., Chaves, M.L.S.C., Chukanov, N.V., Atencio, D., Scholz, R., Pekov, I.V., da Costa, G.M. Morrison, S.M., Andrade, M.B., Freitas, E.T.F., Downs, R.T., Belakovskiy, D.I. (2018) Parisite-(La), CaLa2(CO3)3F2, a new mineral from Novo Horizonte, Bahia, Brazil. Mineralogical Magazine: 82: 133-144.

Synonyms of Parisite-(La)Hide

Other InformationHide

IR Spectrum:
The IR spectrum confirms the absence of OH groups
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 Parisite-(La)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Menezes Filho, L.A.D., Chaves, M.L.S.C., Chukanov, N.V., Atencio, D., Scholz, R., Pekov, I., Magela da Costa, G., Morrison, S.M., Andrade, M., Freitas, E., Downs, R.T. Belakovskiy, D.I. (2016) Parisite-(La), IMA 2016-031. CNMNC Newsletter No. 32, August 2016, page 920. Mineralogical Magazine: 80: 915–922
Menezes Filho, L.A.D., Chaves, M.L.S.C., Chukanov, N.V., Atencio, D., Scholz, R., Pekov, I.V., da Costa, G.M. Morrison, S.M., Andrade, M.B., Freitas, E.T.F., Downs, R.T., Belakovskiy, D.I. (2018) Parisite-(La), CaLa2(CO3)3F2, a new mineral from Novo Horizonte, Bahia, Brazil. Mineralogical Magazine: 82: 133-144.

Internet Links for Parisite-(La)Hide

Localities for Parisite-(La)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)
 
  • Bahia
    • Novo Horizonte
      • Tapera
Menezes Filho, L.A.D., Chaves, M.L.S.C., Chukanov, N.V., Atencio, D., Scholz, R., Pekov, I.V., da Costa, G.M. Morrison, S.M., Andrade, M.B., Freitas, E.T.F., Downs, R.T., Belakovskiy, D.I. (2018): Parisite-(La), CaLa2(CO3)3F2, a new mineral from Novo Horizonte, Bahia, Brazil. Mineralogical Magazine: 82: 133-144.
Mineral and/or Locality  
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