Caysichite-(Y)
A valid IMA mineral species
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About Caysichite-(Y)
Formula:
(Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O
Previously given as Ca2Y2Si4O10(CO3)3 · 4H2O.
Colour:
Colourless, white, pale yellow, rarely greenish
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
3.03
Crystal System:
Orthorhombic
Name:
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).
Unique Identifiers
Mindat ID:
922
Long-form identifier:
mindat:1:1:922:9
GUID
(UUID V4):
(UUID V4):
1e4f9141-4b32-44ec-b4df-c5b78b9590c0
IMA Classification of Caysichite-(Y)
Approved
First published:
1974
Classification of Caysichite-(Y)
9.DJ.15
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
70.1.2.2
70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
17.4.11
17 : Silicates Containing other Anions
4 : Silicates with carbonates
17 : Silicates Containing other Anions
4 : Silicates with carbonates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Cay-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Cay | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Caysichite-(Y)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white, pale yellow, rarely greenish
Streak:
White
Hardness:
4½ on Mohs scale
Density:
3.03 g/cm3 (Measured) 3.029 g/cm3 (Calculated)
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°
Max Birefringence:
δ = 0.035 - 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v
Optical Extinction:
X = b; Y = a; Z = c.
Chemistry of Caysichite-(Y)
Mindat Formula:
(Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O
Previously given as Ca2Y2Si4O10(CO3)3 · 4H2O.
Previously given as Ca2Y2Si4O10(CO3)3 · 4H2O.
Crystallography of Caysichite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 13.282(3) Å, b = 13.925(3) Å, c = 9.724(4) Å
Ratio:
a:b:c = 0.954 : 1 : 0.698
Unit Cell V:
1,798.47 ų (Calculated from Unit Cell)
Z:
4
Comment:
Non-standard space-group setting Ccm21.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005150 | Caysichite-(Y) | Mellini M, Merlino S (1978) Caysichite: A double crankshaft chain structure The Canadian Mineralogist 16 81-88 |  | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.93 Å | (100) |
| 3.321 Å | (90) |
| 4.38 Å | (60) |
| 4.22 Å | (60) |
| 3.481 Å | (60) |
| 4.87 Å | (40) |
| 2.323 Å | (40) |
Comments:
Evans-Lou quarry, Quebec, Canada. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Caysichite-(Y)
General Appearance of Type Material:
Coating on fractures or as incrustations with a divergent columnar structure. Rare terminated crystals.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada.
Canadian Geological Survey, Ottawa, Canada, 10402.
The Natural History Museum, London, England, 1977,278.
Canadian Geological Survey, Ottawa, Canada, 10402.
The Natural History Museum, London, England, 1977,278.
Geological Setting of Type Material:
Granite pegmatite.
Associated Minerals at Type Locality:
Reference:
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)
Other Language Names for Caysichite-(Y)
Common Associates
Associated Minerals Based on Photo Data:
| 7 photos of Caysichite-(Y) associated with Quartz | SiO2 |
| 4 photos of Caysichite-(Y) associated with Isomertieite | Pd11Sb2As2 |
| 3 photos of Caysichite-(Y) associated with Yttrofluorite | (Ca1-xYx)F2+x where 0.05< x |
| 3 photos of Caysichite-(Y) associated with Mertieite | Pd8Sb2.5As0.5 |
| 2 photos of Caysichite-(Y) associated with Aegirine | NaFe3+Si2O6 |
| 1 photo of Caysichite-(Y) associated with Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 1 photo of Caysichite-(Y) associated with Albite | Na(AlSi3O8) |
| 1 photo of Caysichite-(Y) associated with Xenotime-(Y) | Y(PO4) |
| 1 photo of Caysichite-(Y) associated with Pseudomertieite | Pd11(Sb,As)4 |
| 1 photo of Caysichite-(Y) associated with Zincochromite | ZnCr2O4 |
Related Minerals - Strunz-mindat Grouping
| 9.DJ.05 | Narsarsukite | Na4(Ti,Fe)2[Si8O20](O,OH,F)2 |
| 9.DJ.10 | Laplandite-(Ce) | Na4CeTiPO4Si7O18 · 5H2O |
| 9.DJ.20 | Seidite-(Ce) | Na4(Ce,Sr)2[TiSi8O18(OH)2](O,OH,F)4 · 5H2O |
| 9.DJ.25 | Carlosturanite | (Mg,Fe,Ti)21(Si,Al)12O28(OH)34 · H2O |
| 9.DJ.30 | Jonesite | Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2O |
Fluorescence of Caysichite-(Y)
Not fluorescent in LW or SW UV.
Other Information
Notes:
Faint green cathodoluminescence.
Effervesces slowly in cold, dilute HCl.
Effervesces slowly in cold, dilute HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Caysichite-(Y)
mindat.org URL:
https://www.mindat.org/min-922.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Caysichite-(Y)
Reference List:
Fleischer, Michael, Pabst, Adolf, Mandarino, Joseph A., Chao, George Y., Cabri, Louis, J. (1976) New Mineral Names. American Mineralogist, 61 (1-2) 174-186
Localities for Caysichite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| |
Canada (TL) | |
| Hogarth et al. (1974) |
Germany | |
| Habel (2009) |
Italy | |
| Palenzona A. et al. (Y) |
| Palenzona et al. (2004) +1 other reference | |
Japan | |
| Yamada et al. (2004) |
Malawi | |
| Massanek (1999) +1 other reference |
Norway | |
| Kristiansen (1993) |
Russia | |
| Voloshin A.V. et al. (1986) +1 other reference |
| Pekov et al. (2008) |
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Mount Malosa, Zomba, Southern Region, Malawi