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Ca2Y2Si4O10(CO3)3 · 4H2O
Colourless, white, pale yellow, rarely greenish
Crystal System:
Named for the composition that includes CAlcium, Yttrium, SIlicon, Carbon, and Hydrogen. The suffix was added in 1987 and denotes the dominant rare earth element. The pronunciation is kā-sichaite.
This page provides mineralogical data about Caysichite-(Y).

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Classification of Caysichite-(Y)Hide

First Published:

9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains

70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Physical Properties of Caysichite-(Y)Hide

Transparent, Translucent
Colourless, white, pale yellow, rarely greenish
4½ on Mohs scale

Optical Data of Caysichite-(Y)Hide

Biaxial (-)
RI values:
nα = 1.586 - 1.589 nβ = 1.614 - 1.616 nγ = 1.621 - 1.626
Measured: 61° , Calculated: 52° to 60°
Max Birefringence:
δ = 0.035 - 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v

Chemical Properties of Caysichite-(Y)Hide

Ca2Y2Si4O10(CO3)3 · 4H2O
IMA Formula:
(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) · 7H2O

Crystallography of Caysichite-(Y)Hide

Crystal System:
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 13.282(3) Å, b = 13.925(3) Å, c = 9.724(4) Å
a:b:c = 0.954 : 1 : 0.698
Unit Cell V:
1,798.47 ų (Calculated from Unit Cell)
Non-standard space-group setting Ccm21.

Type Occurrence of Caysichite-(Y)Hide

General Appearance of Type Material:
Coating on fractures or as incrustations with a divergent columnar structure. Crystals rare.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa.
Canadian Geological Survey, Ottawa, Canada, 10402.
The Natural History Museum, London, England, 1977,278.
Geological Setting of Type Material:
Granite pegmatite
Hogarth, D.D., Chao, G.Y., Plant. G.A., Steacy, H. R. (1974) Caysichite, a new silico-carbonate of yttrium and calcium. Canadian Mineralogist: 12: 293-298.

Synonyms of Caysichite-(Y)Hide

Other Language Names for Caysichite-(Y)Hide

Simplified Chinese:碳硅钙钇石
Traditional Chinese:碳矽鈣釔石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz4 photos of Caysichite-(Y) associated with Quartz on
Yttrofluorite3 photos of Caysichite-(Y) associated with Yttrofluorite on

Related Minerals - Nickel-Strunz GroupingHide

9.DJ.10Laplandite-(Ce)Na4CeTiPO4Si7O18 · 5H2O
9.DJ.20Seidite-(Ce)Na4(Ce,Sr)2Ti[(O,OH,F)5|Si8O18(OH)] · 5H2OMon.
9.DJ.30JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide,Fe)2[Si8O20](O,OH,F)2Tet.,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.4.4ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m
17.4.5FukaliteCa4[Si2O6][CO3](OH)2Mon. 2/m : P21/b
17.4.6MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
17.4.7Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mbm
17.4.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2OOrth. mmm (2/m 2/m 2/m)
17.4.12Lepersonnite-(Gd)Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2O
17.4.13AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2OTet.
17.4.15Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2Tric. 1 : P1

Fluorescence of Caysichite-(Y)Hide

Not fluorescent in LW or SW UV

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 Caysichite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hogarth, D.D., Chao, G.Y., Plant. G.A., Steacy, H. R. (1974) Caysichite, a new silico-carbonate of yttrium and calcium. Canadian Mineralogist: 12: 293-298.
Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y., Cabri, L.J. (1976) New mineral names. American Mineralogist: 61: 174-186.
Mellini, M., Merlino, S. (1978) Caysichite: a double crankshaft chain structure. Canadian Mineralogist: 16: 81-88.
Nickel, E.H., Mandarino, J.A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist: 72: 1031-1042.

Internet Links for Caysichite-(Y)Hide

Localities for Caysichite-(Y)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
  • South Australia
    • Olary Province
      • Yunta
Canada (TL)
  • Québec
    • Outaouais
      • Les Collines-de-l'Outaouais RCM
        • Val-des-Monts
          • Lac Saint-Pierre (Wakefield Lake)
Hogarth, D.D., Chao, G.Y., Plant. G.A. & Steacy, H. R. (1974): Caysichite, a new silico-carbonate of yttrium and calcium. Canadian Mineralogist.12: 293-298
  • Bavaria
    • Lower Bavaria
      • Röhrnbach
Habel, M. (2009): Der Granodioritbruch der Fa. Josef Uhrmann OHG, Steinerleinbach bei Röhrnbach. Mineralien-Welt 20 (2), 66-86.
  • Liguria
    • Savona Province
      • Sassello
Palenzona A., Martinelli A., Pani M., Selmi P., 2004. La caysichite-(Y) di Veirera (Gruppo di Voltri, Liguria centrale). Riv. Mineral. Ital., 28, 4: 253-255
Palenzona, A., Martinelli, A., Pani, M., Selmi, P. (2004): La caysichite-(Y) di Veirera (Gruppo di Voltri, Liguria centrale). Riv. Mineral. Ital., 28, 4 (4-2004), 253-255; Martinelli, A. (2013): Segnalazioni in breve. Novità e conferme da Veirera. Prie, 9, 26.
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Kawamata
          • Iizaka Village (Iisaka)
Yamada et al. (2004) [cited in Hori et al. (2006): Iwashiroite-(Y), YTaO4, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 101, 170-177.]
  • Zomba District
Massanek, A. (1999): Neu aus Malawi: Caysichit-(Y), Lapis 24 (4),33; Cairncross, B. (2002). Aegirine and Associated Minerals from Mount Malosa, Malawi. Rocks & Minerals, 77(1), 31-37.
  • Telemark
    • Kragerø
      • Lindvikskollen-Kalstadgangen pegmatite
Kristiansen, Roy (1993): Caysichitt-(Y) og Chernovitt-(Y) fra Lindvikskollen, Kragerø; to nye mineraler for Norge. STEIN 20 (2), 125-128
  • Northern Region
    • Murmanskaya Oblast'
      • Keivy Mountains
        • Western Keivy Massif
Voloshin A.V., Pakhomovskii Ya.A. [Волошин А. В., Пахомовский Я. А.] (1986): Minerals and evolution of mineral formation in amazonite pegmatites of the Kola Peninsula [Минералы и эволюция минералообразования в амазонитовых пегматитах Кольского полуострова]. Nauka, Leningrad, 168 pp. (in Russian); Voloshin A.V., Pakhomovskii Ya.A., Zezulina E.P. [Волошин А.В., Пахомовский Я.А., Зезулина Е.П.] (1986): Caysichite from amazonite pegmatites of the Kola Peninsula [Кайсикхит из амазонитовых пегматитов Кольского полуострова]. Min. Zhurnal [Мин. Журнал], 8, 90-93 (in Russian).
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