Coquimbit

Structural context

Coquimbite
Crystal System trigonalCrystal Class hexagonal scalenohedralSpace Group P-31c

Chemical context

Stoichiometric formulas

Coquimbite
mindat.org
  • March 13, 2023AlFe3(SO4)6(H2O)12·6H2OFormerly given as Fe2-xAlx(SO4)3.9H2O (x ~0.5) or even Fe2(SO4)3.9H2O; redefined by IMA in 2019 (Al is essential)
IMA
  • March 13, 2023AlFe3(SO4)6(H2O)12 · 6H2O
mineralogy.rocks
  • Aug. 30, 2022AlFe3+3(SO4)6(H2O)12·6H2O

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • light violet
    • greenish white
    • bluish white
    • yellowish white
    • brownish white
    Color noteOriginal color note from the source
    Light violet to purple, greenish white, bluish white, yellowish white, brownish white
    StreakStreak entities, recognized using a custom trained NER model
      Streak noteOriginal streak note from the source
      White
      Lustre
      Sub-Vitreous
      Resinous
      Waxy
      Greasy
      Fracture
      Sub-Conchoidal
      Transparency
      Transparent
      Tenacity
      brittle
      Hardness
      2.5
      Calculated density
      2.12