Mineral Information and Data:

Metahaiweeite  
Ca(UO2)2Si6O15 • nH2O [CNMNC approved formula]

Named Dehydration product of haiweeite.

IMA status : Approved Species 1959 ()
CLASSIFICATION 
Dana
(8th edition) :
53.03.02.03  
  (53) Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.03) with (UO2)
  (53.03.02) Weeksite group
  
Nickel-Strunz
(10th edition) :
09.AK.25
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AK) Uranyl neso- and polysilicates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  
Other Properties: Radioactive.

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