Pargasit

Structural context

Pargasite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m

Chemical context

Stoichiometric formulas

Pargasite
mindat.org
  • March 13, 2023NaCa2(Mg4Al)(Si6Al2)O22(OH)2Pargasite is defined as a pargasite group member with the following dominant elements: A position: Na C position: Mg as the dominant divalent cation and Al as the dominant trivalent cation. W position: OH as the dominant anion
IMA
  • March 13, 2023NaCa2(Mg4Al)(Si6Al2)O22(OH)2
mineralogy.rocks
  • Aug. 30, 2022NaCa2(Mg4Al)(Si6Al2)O22(OH)2

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • light-brown
  • greenish-brown
  • dark green
    Color noteOriginal color note from the source
    Light-brown, brown, greenish-brown to dark green and black.
    StreakStreak entities, recognized using a custom trained NER model
    • pale grey-green
    • brownish-green
    Streak noteOriginal streak note from the source
    Pale grey-green to brownish-green.
    Lustre
    Vitreous
    Luminescence
    Nonfluorescent
    Hardness
    5—6