Mineral Information and Data:

Caysichite-(Y)
(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) • 7H2O [CNMNC approved formula]

Named for the composition (Ca, Y, Si, CO3).

IMA status : Approved Species 1974 ()
CLASSIFICATION 
Dana
(8th edition) :
70.01.02.02  
  (70) Inosilicate Column or Tube Structures
  (70.01) with columnar silicate units
  (70.01.02) Double crankshaft chains
  
Nickel-Strunz
(10th edition) :
09.DJ.15
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DJ) with 4-periodic double and triple chains
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
  
  
  

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