Name: from FERRIc iron and sodium (NATRium).
Clades:
Sulfates.
Chemical: Na3Fe(SO4)3·3H2O.
Colour: colourless, grayish white, pale green, bluish green, amethystine; colourless in transmitted light.
Lustre: vitreous.
Hardness: 2½.
Specific gravity: 2.55 to 2.61.
Crystal system: Trigonal.