Symplesite

Formula: Fe₃(AsO₄)₂.8H₂O

Origin of name: from Greek for to bring together

Crystal system: triclinic

Crystal class: -1

Twinning: common on {001}

Unit cell: a = 7.87 Å, b = 9.41 Å, c = 4.72 Å, a = 99.9°, b = 97.4°, g = 106.0°

Colour: green, light blue, deep indigo blue

Diaphaneity: 

Luster: vitreous, dull, earthy, pearly

Habit: crystals imperfect, small, radial fibrous forming spherical aggregates

Hardness: about 2.5

Specific gravity: 3.01

Cleavage: 1; {1-10} perfect

Tenacity: uneven, brittle

Streak: 

Synonyms/varieties:

Comments: dimorphous with parasymplesite