Risörit

Structural context

Fergusonite-(Y)
Crystal System tetragonalCrystal Class tetragonal dipyramidalSpace Group I41/a

Chemical context

Stoichiometric formulas

Risörite
mindat.org
  • March 13, 2023(Y,Er)(Nb,Ti,Ta)(O,OH)4
mineralogy.rocks
  • Aug. 30, 2022(Y,Er)(Nb5+,Ti4+,Ta)(O,OH)4
Fergusonite-(Y)
mindat.org
  • March 13, 2023YNbO4
IMA
  • March 13, 2023YNbO4
mineralogy.rocks
  • Aug. 30, 2022YNb5+O4

Physical properties

ColorColor entities, recognized using a custom trained NER model
        Color noteOriginal color note from the source
        Grey, yellow, brown
        StreakStreak entities, recognized using a custom trained NER model
        • yellow brown
        • greenish gray
        Streak noteOriginal streak note from the source
        Brown, yellow brown, greenish gray
        Lustre
        Vitreous
        Sub-Metallic
        Dull
        Fracture
        Sub-Conchoidal
        Transparency
        Opaque
        Tenacity
        brittle
        Hardness
        5.5—6.5
        Measured density
        5.6—5.8
        Calculated density
        5.65