Ettringit

Structural context

Ettringite
Crystal System trigonalCrystal Class ditrigonal pyramidalSpace Group P31c

Chemical context

Stoichiometric formulas

Ettringite
mindat.org
  • March 13, 2023Ca6Al2(SO4)3(OH)12·26H2O
IMA
  • March 13, 2023Ca6Al2(SO4)3(OH)12 · 27H2O
mineralogy.rocks
  • Aug. 30, 2022Ca6Al2(S6+O4)3(OH)12·26H2O

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • colourless
  • colourless
Color noteOriginal color note from the source
Colourless; colourless in transmitted light.
Transparency
Transparent
Hardness
2—2.5
Calculated density
1.76