Formula: Ca6Mg2(SO4)2(CO3)2Cl4(OH)4·7H2O
Origin of name: for the Russian mineralogist Tat'yana L'vovna Evstigneeva (or Yestigneeva) (1945-) of the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences (Moscow), in recognition of her work on platinum group minerals and other ore minerals of the Noril'sk complex.
Crystal system: Orthorhombic
Crystal class: mmm, mm2 or 222
Twinning:
Unit cell: a = 7.89, b = 4.07, c = 7.73
Colour: Pink
Diaphaneity: Opaque
Luster: Metallic
Habit: Granular, platy, ductile
Hardness: 3.5-4
Specific gravity:
Cleavage: None
Tenacity: Malleable, ductile
Streak:
Synonyms/varieties:
Comments:
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