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Cayalsite-(Y)

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About Cayalsite-(Y)Hide

Formula:
CaY6Al2Si4O18F6
Colour:
Colourless to faintly pink
Crystal System:
Orthorhombic
Name:
Name after the chemical composition: Ca(lcium)Y(ttrium)Al(uminium)Si(licon).
Two maximum degree of order (MDO) polytypic modifications, cayalsite-(Y)-1O and cayalsite-(Y)-1M, are known. The element combination is slightly similar to that in (more complex) hundholmenite-(Y), but there is no relation between these minerals.

Crystal structure details/elements:
- linear chains of AlO6 octahedra that share edges
- isolated SiO4 tetrahedra
- REE and Ca, substitutionally disordered, have both the coordination number 8, being surrounded by O and F anions
- substitutional and positional disorder of the silicate tetrahedra in one of silicate-bearing layers
- no close Si-F contacts -> partial splitting of the position of O and F atoms.


Classification of Cayalsite-(Y)Hide

Approved
Approval Year:
2012

Physical Properties of Cayalsite-(Y)Hide

Colour:
Colourless to faintly pink

Optical Data of Cayalsite-(Y)Hide

Type:
Biaxial (+)
RI values:
nα = 1.730(5) nβ = 1.740(5) nγ = 1.760(5)
2V:
Measured: 56.5° (5)
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Cayalsite-(Y)Hide

Formula:
CaY6Al2Si4O18F6
IMA Formula:
CaY6Al2Si4O18F6

Crystallography of Cayalsite-(Y)Hide

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Cayalsite-(Y)-1MCayalsite-(Y)-1O
  
Monoclinic Orthorhombic 
2/m - Prismaticmmm (2/m 2/m 2/m) - Dipyramidal
P2/b Pban
P2/c Pban
a = 11.0602(7) Å, b = 5.5280(2) Å, c = 16.0195(9) Å
β = 118.925(3)°
a = 15.993(1) Å, b = 5.5306(3) Å, c = 9.6590(7) Å
a:b:c = 2.001 : 1 : 2.898a:b:c = 2.892 : 1 : 1.746
V 857.26 ų
(Calculated from Unit Cell)
V 854.35 ų
(Calculated from Unit Cell)
  

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.222 (22)
4.584 (15)
4.094 (17)
3.997 (16)
3.547 (58)
2.992 (100)
2.776 (15)
2.727 (15)

Type Occurrence of Cayalsite-(Y)Hide

Place of Conservation of Type Material:
Mineralogical Museum of the University of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany, catalogue numbers NO-002B/08 (1O polytype) and NO-002/08 (1M polytype)

Synonyms of Cayalsite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Yttrofluorite2 photos of Cayalsite-(Y) associated with Yttrofluorite on mindat.org.

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 Cayalsite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Malcherek, T., Schlüter, J., Husdal, T.A., Cooper, M.A. (2012) Cayalsite-(Y), IMA 2011-094. CNMNC Newsletter No. 13, June 2012, page 814; Mineralogical Magazine, 76, 807-817.
Malcherek, T., Schlüter, J., Cooper, M.A., Ball, N., Husdal, T. (2015): Cayalsite-(Y), a new rare earth calcium aluminium fluorosilicate with OD character. European Journal of Mineralogy, 27, 683-694.

Internet Links for Cayalsite-(Y)Hide

Localities for Cayalsite-(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.
Norway (TL)
 
  • Nordland
    • Tysfjord
      • Drag
        • Lapplægeret
Malcherek, T., Schlüter, J., Cooper, M.A., Ball, N., Husdal, T. (2015): Cayalsite-(Y), a new rare earth calcium aluminium fluorosilicate with OD character. European Journal of Mineralogy, 27, 683-694.
Malcherek, T., Schlüter, J., Cooper, M.A., Ball, N., Husdal, T. (2015): Cayalsite-(Y), a new rare earth calcium aluminium fluorosilicate with OD character. European Journal of Mineralogy, 27, 683-694
Mineral and/or Locality  
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