Parasymplesite

Formula: Fe₃(AsO₄)₂.8H₂O

Origin of name: from Greek para = similar and symplesite

Crystal system: monoclinic

Crystal class: 2/m

Twinning: on {1-10}

Unit cell: a = 10.35 Å, b = 13.52 Å, c = 4.79 Å, b = 104.9°

Colour: light greenish blue

Diaphaneity: 

Luster: 

Habit: crystals to 3 mm

Hardness: 2

Specific gravity: 3.07

Cleavage: 1; {010} perfect

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: dimorphous with symplesite, series with köttigite