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(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) · 7H2O
Colourless, white, pale ...
This page provides mineralogical data about Caysichite-(Y).

Classification of Caysichite-(Y)


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)

Diaphaneity (Transparency):
Transparent, Translucent
Colourless, white, pale yellow, rarely greenish
Hardness (Mohs):

Optical Data of Caysichite-(Y)

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)

IMA Formula:
(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) · 7H2O
Elements listed in formula:

Crystallography of Caysichite-(Y)

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 Volume:
V 1,798.47 ų (Calculated from Unit Cell)
Non-standard space-group setting Ccm21.

Type Occurrence of Caysichite-(Y)

Relationship of Caysichite-(Y) to other Species

9.DJ.10Laplandite-(Ce)Na4CeTiPSi7O22 · 5H2O
9.DJ.20Seidite-(Ce)Na4(Ce,Sr)2TiSi8O18(O,OH,F)6 · 5H2O
9.DJ.25Carlosturanite(Mg,Fe2+,Ti)21(Si,Al)12O28(OH)34 · H2O
9.DJ.30JonesiteKBa2Ti2(Si5Al)O18 · nH2O
17.4.4ScawtiteCa7(Si3O9)2(CO3) · 2H2O
17.4.7Cancrinite(Na,Ca,◻)8(Al6Si6)O24(CO3,SO4)2 · 2H2O
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(F,OH) · H2O
17.4.10Kainosite-(Y)Ca2Y2(SiO3)4(CO3) · H2O
17.4.12Lepersonnite-(Gd)CaGd2(UO2)24(CO3)8Si4O28 · 60H2O
17.4.14Surite(Pb,Ca)3Al2(Si,Al)4O10(CO3)2(OH)3 · 0.3H2O

Other Names for Caysichite-(Y)

Name in Other Languages:
Simplified Chinese:碳硅钙钇石
Traditional Chinese:碳矽鈣釔石

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 Caysichite-(Y)

Reference List:
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.

Mellini, M. and Merlino, S. (1978) Caysichite: a double crankshaft chain structure. Canadian Mineralogist: 16: 81-88.

Internet Links for Caysichite-(Y) URL:
Please feel free to link to this page.

Localities for Caysichite-(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.
  • 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
    • Murmanskaja Oblast'
      • Kola Peninsula
        • 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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