Schizolite
A sodium-calcium-manganese silicate described in 1901 from South Greenland — named for its perfect cleavage.
Intro adapted from Wikipedia (CC BY-SA).
Schizolite is an IMA-recognized mineral species in the silicate class, with the chemical formula NaCaMnSi₃O₈(OH).
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Pectolite structural group.
Key properties: specific gravity 3.09; White streak; Vitreous luster; optically biaxial.
IMA symbol Szl, IMA status: approved, named in 2013.
Found in nepheline syenite (Greenland); in skarn formed by metasomatic alteration of manganese rich metasediments (Wessels).
It is found associated with Serandite, calcite aegirine, hydroxyapophyllite-(K), pectolite (Wessels).
The name comes from the Greek, skhizo, for ‘to split’ in allusion to its perfect cleavage. Formerly ‘marshallsussmanite’, now discredited.