Quenstedtite

Formula: Fe₂(SO₄)₃.10H₂O

Origin of name: for Friedrich A. Von Quenstedt (1809-1889), German paleontologist and stratigrapher, University of Tübingen, Germany

Crystal system: Triclinic, pseudomonoclinic

Crystal class: -1

Twinning: Common on {010}

Unit cell: a = 6.15, b = 23.77, c = 6.56, α = 94.17°, β = 101.74°, γ = 96.31°

Colour: Pale violet to reddish violet

Diaphaneity: Transparent

Luster: 

Habit: Crystals highly modified tabular or short prismatic, minute

Hardness: 2.5

Specific gravity: 2.14

Cleavage: 2; {010} perfect, {100} good

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Soluble in water