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Caysichite-(Y)

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Veirera, Sassello, Savona Province, Liguria, Italy
© R. Bracco

Show Caysichite-(Y) Photos (3)
Formula:
Y
 
2
(Ca,Gd)
 
2
Si
 
4
O
 
10
(CO
 
3
)
 
3
·4H
 
2
O
Hardness:4½
This page provides mineralogical data about Caysichite-(Y).

Classification of Caysichite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/F.36-05
Nickel-Strunz 10th (pending) edition ID:9.DJ.15

9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
Dana 8th edition ID:70.1.2.2

70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
Hey's CIM Ref.:17.4.11

17 : Silicates Containing other Anions
4 : Silicates with carbonates
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Type Occurrence of Caysichite-(Y)

Type Locality:Evans-Lou Mine, St-Pierre-de-Wakefield, Portland Township, Papineau Co., Québec, Canada

Physical Properties of Caysichite-(Y)

Hardness (Mohs):4½

Optical Data of Caysichite-(Y)

Type:Biaxial (-)
RI values: nα = 1.586 - 1.589 nβ = 1.614 - 1.616 nγ = 1.621 - 1.626
2V:Measured: 61° , Calculated: 52° to 60°
Maximum Birefringence:δ = 0.035 - 0.037

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v

Chemical Properties of Caysichite-(Y)

Formula:
Y
 
2
(Ca,Gd)
 
2
Si
 
4
O
 
10
(CO
 
3
)
 
3
·4H
 
2
O
Essential elements:C, Ca, H, O, Si, Y
All elements listed in formula:C, Ca, Gd, H, O, Si, Y

Relationship of Caysichite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DJ.05Narsarsukite
Na
 
2
(Ti,Fe)Si
 
4
(O,F)
 
11
9.DJ.10Laplandite-(Ce)
Na
 
4
CeTiPO
 
4
Si
 
7
O
 
18
·5H
 
2
O
9.DJ.20Seidite-(Ce)
Na
 
4
(Ce,Sr)
 
2
Ti[(O,OH,F)
 
5
|Si
 
8
O
 
18
(OH)]·5H
 
2
O
9.DJ.25Carlosturanite
(Mg,Fe,Ti)
 
21
(Si,Al)
 
12
O
 
28
(OH)
 
34
9.DJ.30Jonesite
Ba
 
4
(K,Na)
 
2
Ti
 
4
Al
 
2
[O|(SiO
 
4
)
 
2
|Si
 
3
O
 
9
]
 
2
 · 6H
 
2
O
Related Minerals - Hey's Index Grouping:
17.4.1Tilleyite
Ca
 
5
[(CO
 
3
)
 
2
|Si
 
2
O
 
7
]
17.4.2Spurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
17.4.3Paraspurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
17.4.4Scawtite
Ca
 
7
Si
 
6
(CO
 
3
)O
 
18
·2H
 
2
O
17.4.5Fukalite
Ca
 
4
[CO
 
3
|(HSiO
 
4
)
 
2
]
17.4.6Meionite
Ca
 
4
[CO
 
3
|(Al
 
2
Si
 
2
O
 
8
)
 
3
]
17.4.7Cancrinite
Na
 
6
Ca
 
2
[(CO
 
3
)
 
2
|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
17.4.8Carletonite
KNa
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F)·H
 
2
O
17.4.9Iimoriite-(Y)
Y
 
2
[CO
 
3
|SiO
 
4
]
17.4.10Kainosite-(Y)
Ca
 
2
(Y,Ce)
 
2
Si
 
4
O
 
12
CO
 
3
·H
 
2
O
17.4.12Lepersonnite-(Gd)
CaO(Gd,Dy)
 
2
O
 
3
·24UO
 
3
·8CO
 
2
·4SiO
 
2
·60H
 
2
O
17.4.13Ashburtonite
Pb
 
4
Cu
 
4
[(OH)
 
3
|Cl|(HCO
 
3
)
 
4
|Si
 
4
O
 
12
] · H
 
2
O
17.4.14Surite
Pb(Pb,Ca)(CO
 
3
)
 
2
(Al,Fe,Mg)
 
2
(Si,Al)
 
4
O
 
10
(OH)
 
2
17.4.15Tundrite-(Ce)
Na
 
2
Ce
 
2
TiO
 
2
(SiO
 
4
)(CO
 
3
)
 
2
17.4.16Tundrite-(Nd)
Na
 
3
(Nd,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH)·2H
 
2
O

Other Names for Caysichite-(Y)

Synonyms:
IMA1973-044
Russian names:
Кайсикхит-(Y)

Other Information

Health Warning: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:American Mineralogist (1976): 61: 174-175.

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

Internet Links for Caysichite-(Y)

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    Localities for Caysichite-(Y)

    (TL) indicates type locality. ? 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.
    Australia
     
    • South Australia
      • Mt Lofty Ranges
        • North Mt Lofty Ranges
          • Yunta
    Canada
     
    • Québec
      • Papineau Co.
        • Portland Township
          • St-Pierre-de-Wakefield
    		No reference listed
    Italy
     
    • 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
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Kawamata
            • Iizaka (Iisaka) Village
    		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.]
    Malawi
     
    • Zomba District
    		Massanek, A. (1999): Neu aus Malawi: Caysichit-(Y), Lapis 24 (4),33
    Norway
     
    • Telemark
      • Kragerø
        • Kalstad-Lindvikskollen pegmatite
    		Kristiansen, Roy (1993): Caysichitt-(Y) og Chernovitt-(Y) fra Lindvikskollen, Kragerø; to nye mineraler for Norge. STEIN 20 (2), 125-128
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Western Keivy Massif
    		A.V. Voloshin, Ya.A. Pakhomovskii Minerals and mineralformation evolution in amazonite pegmatites of Kola peninsula, - Leningrad, Nauka, 1986, pp.168.
    Mineral and/or Locality
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