Mineral Information and Data:

Amarillite
NaFe(SO4)2 • 6H2O [CNMNC approved formula]

Named for the locality: Tierra Amarilla, southeast of Copiapo, Atacama, Chile.

IMA status : Valid species (Pre-IMA 1933) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
29.05.03.02  
  (29) Hydrated Acid and Sulfates
  (29.05) where A B (XO4)2 · x(H2O)
  (29.05.03)
  
Nickel-Strunz
(10th edition) :
07.CC.75
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.C) Sulfates (selenates, etc.) without Additional Anions, with H2O
  (07.CC) With medium-sized and large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 8.419 Å, b = 10.8409 Å, c = 12.4717 Å, b = 95.495°
Crystal Habit: Crystals thick tabular; equant; rarely prismatic
  
Color: Pale yellow with faint greenish tint
Diaphaneity: Transparent
Luster: Vitreous to adamantine
Hardness (Mohs): 2.5 - 3
Measured Density: 2.19 g/cm3
Cleavage: 1; {110} good
Tenacity: Brittle
Fracture: Conchoidal
Streak: 1; {110} good
  
Geologic Setting: Formed in the oxidation zones of sulfide deposits.
Mineral Association: Coquimbite, other sulfates.
  
Other Properties: H2O Soluble.
Comments: Taste astringent.

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