Riebeckit

Structural context

Riebeckite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m

Chemical context

Stoichiometric formulas

Riebeckite
mindat.org
  • March 13, 2023◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Riebeckite is defined as a member of the riebeckite group with Fe2+>Mg in the C2+ position and (OH) dominant in the W position.
IMA
  • March 13, 2023◻Na2(Fe2+3Fe3+2)Si8O22(OH)2
mineralogy.rocks
  • Aug. 30, 2022[box]Na2(Fe2+3Fe3+2)Si8O22(OH)2

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • blue-black
  • light blue
  • gray-blue
  • gray
    Color noteOriginal color note from the source
    Usually black, also commonly light blue to blue-black, gray-blue, gray, brown
    StreakStreak entities, recognized using a custom trained NER model
    • pale gray
    • bluish-grey
    Streak noteOriginal streak note from the source
    Pale gray to bluish-grey.
    Lustre
    Vitreous
    Sub-Vitreous
    Fracture
    Splintery
    Transparency
    Translucent
    Opaque
    Luminescence
    Nonfluorescent
    Tenacity
    brittle
    Hardness
    5—5.5