Amarillite

Formula:  NaFe(SO₄)₂ ^. 6H₂O

Origin of name:  Locality; Tierra Amarilla, Chile

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 8.419 Å, b = 10.8409 Å, c = 12.4717 Å, b = 95.495°

Colour:  Pale yellow with faint greenish tinge

Diaphaneity: Transparent

Luster:  Brilliant, vitreous to adamantine

Habit:  Crystals thick tabular; equant; rarely prismatic

Hardness:  2.5 to3

Specific gravity:  2.19

Cleavage: 1; {110} good

Tenacity:

Streak: White

Synonyms/varieties:

Comments:  Soluble in water