Formula: (Mn,Mg)2(Ce,La,Nd)(AsO4)(OH)4
Origin of name: for A. Retzius, Swedish naturalist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: brown, reddish-brown
Diaphaneity: subtranslucent
Luster: vitreous, some greasy to dull
Habit: crystals prismatic or tabular
Hardness: 4
Specific gravity: 4.15
Cleavage:
Tenacity:
Streak: light brown
Synonyms/varieties:
Comments: three distinct species with extensions -(Ce), -(La) and -(Nd) indicating predominant rare earth cation in the composition
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