Formula: (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6.2H2O
Origin of name: for A. de Souza, Brazilian official
Crystal system: monoclinic
Crystal class: 1 or -1
Twinning:
Unit cell:
Colour: dark green
Diaphaneity:
Luster: vitreous
Habit: massive, coarse fibrous
Hardness: 5.5 to 6
Specific gravity: 3.09
Cleavage: 1; {001} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with gormanite
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