Mineral Information and Data:

Aluminocopiapite
(Al,Mg)Fe3+4(SO4)6(OH,O)2 • 20H2O [CNMNC approved formula]

Named for its content of aluminum and relation to the copiapite group.

IMA status : Valid species (Pre-IMA 1947) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
31.10.05.07  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10) miscellaneous
  (31.10.05) Copiapite Group
  
Nickel-Strunz
(10th edition) :
07.DB.35
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DB) With only medium-sized cations; insular octahedra and finite units
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 7.251 Å, b = 18.161 Å, c = 7.267 Å, a = 93.983°, b = 102.283°, g = 97.966°
Crystal Habit: Massive; as thin crusts and coatings
  
Color: Yellowish
Diaphaneity: Transparent to translucent
Luster: Earthy, dull
Hardness (Mohs): 2.5-3
Measured Density: 2.16 g/cm3
Streak: Light yellow
  
  
Other Properties: H2O Soluble.
Comments: H20 soluble.

 

Aluminocopiapite
Origin: Willi Agatz Mine, Dresden, Saxony, Germany
Sample size: 5.5 cm
Photo and Owner: Thomas Witzke

 

Aluminocopiapite
Origin: Willi Agatz Mine, Dresden, Saxony, Germany
Picture size: 1 mm
Photo and Owner: Thomas Witzke

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