Tetragonal - Trapezohedral Class (4 2 2) Mineral Species Listing
AXES
Synonyms: Nickel Sulphate Type, Trapezohedral Hemihedra, or Tetragonal Holoaxial Class.
Space Groups in class: I4122, I422, P41212, P4122, P4212, P422, P42212, P4222, P43212, and P4322.
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(* - Mineral Name is Not IMA Approved) (! - New Dana Classification Number Has Been Changed or Added) (? - IMA Discredited Mineral Species Name