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Cayalsite-(Y)

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Formula:
CaY6Al2Si4O18F6
System:
Orthorhombic
Colour:
Colourless to faintly ...
Name:
Name after the chemical composition: Ca(lcium)Y(trrium)Al(uminium)Si(lisium).
Two maximum degree of order (MDO) polytypic modifications, Cayalsilite-1O and Cayalsilite-(Y)-1M are known.

Classification of Cayalsite-(Y)

Approved 2012
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http://www.mindat.org/min-42752.html
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Type Occurrence of Cayalsite-(Y)

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)

Occurrences of Cayalsite-(Y)

Geological Setting:
In cavities in yttrian fluorite in granitic pegmatite

Physical Properties of Cayalsite-(Y)

Colour:
Colourless to faintly pink

Crystallography of Cayalsite-(Y)

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 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)

Chemical Properties of Cayalsite-(Y)

Formula:
CaY6Al2Si4O18F6
Essential elements:
All elements listed in formula:
Empirical Formula:
Ca1.03 (Y4.73Nd0.02Gd0.34Dy0.43 Er0.31Yb0.226.05Al1.87Si4.03(F6.08O17.9224

Other Names for Cayalsite-(Y)

Name in Other Languages:

Other Information

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)

Reference List:
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)

Localities for Cayalsite-(Y)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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